iseq.c: remove duplicated strings for file paths

* iseq.c (iseq_location_setup): re-use existing string when iseq has
  the same path and absolute_path. [Bug #8149]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40334 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Wed Apr 17 19:45:27 2013  Aman Gupta  <tmm1@ruby-lang.org>
+
+	* iseq.c (iseq_location_setup): re-use existing string when iseq has
+	  the same path and absolute_path. [Bug #8149]
+
 Wed Apr 17 11:38:37 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):

iseq.c

@@ -188,7 +188,10 @@ iseq_location_setup(rb_iseq_t *iseq, VALUE path, VALUE absolute_path, VALUE name
 {
     rb_iseq_location_t *loc = &iseq->location;
     loc->path = path;
-    loc->absolute_path = absolute_path;
+    if (RTEST(absolute_path) && rb_str_cmp(path, absolute_path) == 0)
+	loc->absolute_path = path;
+    else
+	loc->absolute_path = absolute_path;
     loc->label = loc->base_label = name;
     loc->first_lineno = first_lineno;
     return loc;