[turbofan] Clear pending exception from unsuccessful compilation.

src/compiler.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/compiler.h"
 
 #include "src/ast-numbering.h"
 #include "src/bootstrapper.h"
@@ skipping 849 matching lines @@
     VMState<COMPILER> state(isolate);
     PostponeInterruptsScope postpone(isolate);
 
     info.SetOptimizing(BailoutId::None(), handle(function->shared()->code()));
     info.MarkAsContextSpecializing();
 
     if (GetOptimizedCodeNow(&info)) {
       DCHECK(function->shared()->is_compiled());
       return info.code();
     }
+    // We have failed compilation. If there was an exception clear it so that
+    // we can compile unoptimized code.
+    if (isolate->has_pending_exception()) isolate->clear_pending_exception();
   }
 
   if (function->shared()->is_compiled()) {
     return Handle<Code>(function->shared()->code());
   }
 
   CompilationInfoWithZone info(function);
   Handle<Code> result;
   ASSIGN_RETURN_ON_EXCEPTION(isolate, result, GetUnoptimizedCodeCommon(&info),
                              Code);
@@ skipping 641 matching lines @@
 }
 
 
 #if DEBUG
 void CompilationInfo::PrintAstForTesting() {
   PrintF("--- Source from AST ---\n%s\n",
          PrettyPrinter(isolate(), zone()).PrintProgram(function()));
 }
 #endif
 } }  // namespace v8::internal