Remove unique static RegExpEmpty instance.

R=marja@chromium.org
BUG=chromium:430652
LOG=N

Review URL: https://codereview.chromium.org/716113002

Cr-Commit-Position: refs/heads/master@{#25284}
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25284 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ast.h

@@ -3117,10 +3117,6 @@ class RegExpEmpty FINAL : public RegExpTree {
   virtual bool IsEmpty() OVERRIDE;
   virtual int min_match() OVERRIDE { return 0; }
   virtual int max_match() OVERRIDE { return 0; }
-  static RegExpEmpty* GetInstance() {
-    static RegExpEmpty* instance = ::new RegExpEmpty();
-    return instance;
-  }
 };
 
 

src/parser.cc

@@ -111,7 +111,7 @@ void RegExpBuilder::FlushTerms() {
   int num_terms = terms_.length();
   RegExpTree* alternative;
   if (num_terms == 0) {
-    alternative = RegExpEmpty::GetInstance();
+    alternative = new (zone()) RegExpEmpty();
   } else if (num_terms == 1) {
     alternative = terms_.last();
   } else {
@@ -126,12 +126,8 @@ void RegExpBuilder::FlushTerms() {
 RegExpTree* RegExpBuilder::ToRegExp() {
   FlushTerms();
   int num_alternatives = alternatives_.length();
-  if (num_alternatives == 0) {
-    return RegExpEmpty::GetInstance();
-  }
-  if (num_alternatives == 1) {
-    return alternatives_.last();
-  }
+  if (num_alternatives == 0) return new (zone()) RegExpEmpty();
+  if (num_alternatives == 1) return alternatives_.last();
   return new(zone()) RegExpDisjunction(alternatives_.GetList(zone()));
 }