Stop substr re optimisation from rejecting long strs

Using I32 for the fields that record information about the location of
a fixed string that must be found for a regular expression to match
can result in match failures, because I32 is not large enough to store
offsets >= 2**31.

SSize_t is appropriate, since it is 64 bits on 64-bit platforms and 32
bits on 32-bit platforms.

This commit changes enough instances of I32 to SSize_t to get the
added test passing and suppress compiler warnings.  A later commit
will change many more.

1 files changed, 2 insertions, 2 deletions

diff --git a/regexp.h b/regexp.h
index ebbbde180c..8542cb1c95 100644
--- a/regexp.h
+++ b/regexp.h
@@ -36,8 +36,8 @@ struct regexp_engine;
 struct regexp;
 
 struct reg_substr_datum {
-    I32 min_offset;
-    I32 max_offset;
+    SSize_t min_offset;
+    SSize_t max_offset;
     SV *substr;		/* non-utf8 variant */
     SV *utf8_substr;	/* utf8 variant */
     I32 end_shift;