Revert change #26185, which could have some unwanted side-effects.

(lib/warnings.t had failures due to this patch.)
Moreover Dave Mitchell correctly pointed out that [perl #37722]
wasn't really a bug.
p4raw-link: @26185 on //depot/perl: 91cec4fb3b9ce703dab10db05e717127b2a9ed44

p4raw-id: //depot/perl@26190

1 files changed, 2 insertions, 10 deletions

diff --git a/pp_hot.c b/pp_hot.c
index 8502c1c9a1..813b606b0b 100644
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -148,14 +148,11 @@ PP(pp_concat)
     dPOPTOPssrl;
     bool lbyte;
     STRLEN rlen;
-    const char *rpv;
-    bool rbyte;
+    const char *rpv = SvPV_const(right, rlen);	/* mg_get(right) happens here */
+    const bool rbyte = !DO_UTF8(right);
     bool rcopied = FALSE;
 
     if (TARG == right && right != left) {
-	/* mg_get(right) may happen here ... */
-	rpv = SvPV_const(right, rlen);
-	rbyte = !DO_UTF8(right);
 	right = sv_2mortal(newSVpvn(rpv, rlen));
 	rpv = SvPV_const(right, rlen);	/* no point setting UTF-8 here */
 	rcopied = TRUE;
@@ -182,11 +179,6 @@ PP(pp_concat)
 	    SvUTF8_off(TARG);
     }
 
-    /* or mg_get(right) may happen here */
-    if (!rcopied) {
-	rpv = SvPV_const(right, rlen);
-	rbyte = !DO_UTF8(right);
-    }
     if (lbyte != rbyte) {
 	if (lbyte)
 	    sv_utf8_upgrade_nomg(TARG);