Immutable clases and op_arrays.

Squashed commit of the following:

commit cd0c36c3f943849e5b97a8dbe2dd029fbeab3df9
Merge: 4740dabb84 ad6738e886
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 14:43:38 2018 +0300

    Merge branch 'master' into immutable

    * master:
      Remove the "auto" encoding
      Fixed bug #77025
      Add vtbls for EUC-TW encoding

commit 4740dabb843c6d4f7f866b4a2456073c9eaf4c77
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 14:12:28 2018 +0300

    Reverted back ce->iterator_funcs_ptr. Initialize ce->iterator_funcs_ptr fields in immutable classes.

commit ad7a78b253be970db70c2251e66f9297d8e7f829
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:46:30 2018 +0300

    Added comment

commit 0276ea51875bab37be01a4dc5e5a047c5698c571
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:42:43 2018 +0300

    Added type cast

commit c63fc5d5f19c58498108d1698055b2b442227eb3
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:36:51 2018 +0300

    Moved static class members initialization into the proper place.

commit b945548e9306b1826c881918858b5e5aa3eb3002
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:21:03 2018 +0300

    Removed redundand assertion

commit d5a41088401814c829847db212488f8aae39bcd2
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:19:13 2018 +0300

    Removed duplicate code

commit 8dadca8864e66de70a24bdf1181bcf7dd8fb27d7
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 11:05:43 2018 +0300

    Hide offset encoding magic in ZEND_MAP_PTR_IS_OFFSET(), ZEND_MAP_PTR_OFFSET2PTR() and ZEND_MAP_PTR_PTR2OFFSET() macros.

commit 9ef07c88bd76801e2d4fbfeab3ebfd6e6a67ac5f
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 10:48:29 2018 +0300

    typo

commit a06f0f3d3aba53e766046221ee44fb9720389ecc
Merge: 94099586ec 3412345ffe
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Wed Oct 17 10:47:07 2018 +0300

    Merge branch 'master' into immutable

    * master:
      Remove unused variable makefile_am_files
      Classify object handlers are required/optional
      Add support for getting SKIP_TAGSTART and SKIP_WHITE options
      Remove some obsolete config_vars.mk occurrences
      Remove bsd_converted from .gitignore
      Remove configuration parser and scanners ignores
      Remove obsolete buildconf.stamp from .gitignore
      [ci skip] Add magicdata.patch exception to .gitignore
      Remove outdated ext/spl/examples items from .gitignore
      Remove unused test.inc in ext/iconv/tests

commit 94099586ec599117581ca01c15b1f6c5f749e23a
Author: Dmitry Stogov <dmitry@zend.com>
Date:   Mon Oct 15 23:34:01 2018 +0300

    Immutable clases and op_arrays

1 files changed, 34 insertions, 9 deletions

diff --git a/ext/opcache/zend_shared_alloc.c b/ext/opcache/zend_shared_alloc.c
index 8d4d792bb3..fe8d470d58 100644
--- a/ext/opcache/zend_shared_alloc.c
+++ b/ext/opcache/zend_shared_alloc.c
@@ -347,7 +347,7 @@ int zend_shared_memdup_size(void *source, size_t size)
 	return ZEND_ALIGNED_SIZE(size);
 }
 
-static zend_always_inline void *_zend_shared_memdup(void *source, size_t size, zend_bool get_xlat, zend_bool set_xlat, zend_bool free_source)
+static zend_always_inline void *_zend_shared_memdup(void *source, size_t size, zend_bool arena, zend_bool get_xlat, zend_bool set_xlat, zend_bool free_source)
 {
 	void *old_p, *retval;
 	zend_ulong key;
@@ -360,8 +360,13 @@ static zend_always_inline void *_zend_shared_memdup(void *source, size_t size, z
 			return old_p;
 		}
 	}
-	retval = ZCG(mem);
-	ZCG(mem) = (void*)(((char*)ZCG(mem)) + ZEND_ALIGNED_SIZE(size));
+	if (arena) {
+		retval = ZCG(arena_mem);
+		ZCG(arena_mem) = (void*)(((char*)ZCG(arena_mem)) + ZEND_ALIGNED_SIZE(size));
+	} else {
+		retval = ZCG(mem);
+		ZCG(mem) = (void*)(((char*)ZCG(mem)) + ZEND_ALIGNED_SIZE(size));
+	}
 	memcpy(retval, source, size);
 	if (set_xlat) {
 		if (!get_xlat) {
@@ -378,32 +383,42 @@ static zend_always_inline void *_zend_shared_memdup(void *source, size_t size, z
 
 void *zend_shared_memdup_get_put_free(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 1, 1, 1);
+	return _zend_shared_memdup(source, size, 0, 1, 1, 1);
 }
 
 void *zend_shared_memdup_put_free(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 0, 1, 1);
+	return _zend_shared_memdup(source, size, 0, 0, 1, 1);
 }
 
 void *zend_shared_memdup_free(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 0, 0, 1);
+	return _zend_shared_memdup(source, size, 0, 0, 0, 1);
 }
 
 void *zend_shared_memdup_get_put(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 1, 1, 0);
+	return _zend_shared_memdup(source, size, 0, 1, 1, 0);
 }
 
 void *zend_shared_memdup_put(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 0, 1, 0);
+	return _zend_shared_memdup(source, size, 0, 0, 1, 0);
 }
 
 void *zend_shared_memdup(void *source, size_t size)
 {
-	return _zend_shared_memdup(source, size, 0, 0, 0);
+	return _zend_shared_memdup(source, size, 0, 0, 0, 0);
+}
+
+void *zend_shared_memdup_arena_put(void *source, size_t size)
+{
+	return _zend_shared_memdup(source, size, 1, 0, 1, 0);
+}
+
+void *zend_shared_memdup_arena(void *source, size_t size)
+{
+	return _zend_shared_memdup(source, size, 1, 0, 0, 0);
 }
 
 void zend_shared_alloc_safe_unlock(void)
@@ -483,6 +498,16 @@ void zend_shared_alloc_clear_xlat_table(void)
 	zend_hash_clean(&ZCG(xlat_table));
 }
 
+uint32_t zend_shared_alloc_checkpoint_xlat_table(void)
+{
+	return ZCG(xlat_table).nNumUsed;
+}
+
+void zend_shared_alloc_restore_xlat_table(uint32_t checkpoint)
+{
+	zend_hash_discard(&ZCG(xlat_table), checkpoint);
+}
+
 void zend_shared_alloc_register_xlat_entry(const void *old, const void *new)
 {
 	zend_ulong key = (zend_ulong)old;