If map became unstable, abort compilation and allow re-compilation.

BUG=
R=danno@google.com

Review URL: https://codereview.chromium.org/291653006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21438 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/compiler.cc

@@ -456,6 +456,8 @@ OptimizedCompileJob::Status OptimizedCompileJob::GenerateCode() {
     if (optimized_code.is_null()) {
       if (info()->bailout_reason() == kNoReason) {
         info_->set_bailout_reason(kCodeGenerationFailed);
+      } else if (info()->bailout_reason() == kMapBecameUnstable) {
+        return AbortOptimization();
       }
       return AbortAndDisableOptimization();
     }