merge revision(s) 49842: [Backport #10933]

	* symbol.c (Init_sym): make dsym_fstrs a hash compared by identity
	  as the keys are unique fstrings, to get rid of running hash and
	  compare methods and causing new object allocation during garbage
	  collection phase.  [ruby-dev:48891] [Bug #10933]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@50493 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/symbol.c b/symbol.c
index 1127020d17..696f0177b9 100644
--- a/symbol.c
+++ b/symbol.c
@@ -122,7 +122,7 @@ static const struct st_hash_type symhash = {
 void
 Init_sym(void)
 {
-    VALUE dsym_fstrs = rb_hash_new();
+    VALUE dsym_fstrs = rb_ident_hash_new();
     global_symbols.dsymbol_fstr_hash = dsym_fstrs;
     rb_gc_register_mark_object(dsym_fstrs);
     rb_obj_hide(dsym_fstrs);