iseq.c: set coverage at once

* iseq.c (prepare_iseq_build): set coverage at once, not
  repeatedly resetting.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54076 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

iseq.c

@@ -267,6 +267,8 @@ prepare_iseq_build(rb_iseq_t *iseq,
 		   const rb_iseq_t *parent, enum iseq_type type,
 		   const rb_compile_option_t *option)
 {
+    VALUE coverage = Qfalse;
+
     iseq->body->type = type;
     set_relation(iseq, parent);
 
@@ -296,15 +298,14 @@ prepare_iseq_build(rb_iseq_t *iseq,
     ISEQ_COMPILE_DATA(iseq)->option = option;
     ISEQ_COMPILE_DATA(iseq)->last_coverable_line = -1;
 
-    ISEQ_COVERAGE_SET(iseq, Qfalse);
-
     if (!GET_THREAD()->parse_in_eval) {
 	VALUE coverages = rb_get_coverages();
 	if (RTEST(coverages)) {
-	    ISEQ_COVERAGE_SET(iseq, rb_hash_lookup(coverages, path));
+	    coverage = rb_hash_lookup(coverages, path);
-	    if (NIL_P(ISEQ_COVERAGE(iseq))) ISEQ_COVERAGE_SET(iseq, Qfalse);
+	    if (NIL_P(coverage)) coverage = Qfalse;
 	}
     }
+    ISEQ_COVERAGE_SET(iseq, coverage);
 
     return Qtrue;
 }