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

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 2873525604cf0a777546b64a11d5aac1586b9b22..f1200146bb15658f34825daed9aa981d5445e164 100644
--- a/src/compiler.cc
+++ b/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();
     }