[turbofan] Gracefully handle missing info()->context() in CodeGenerator::IsMaterializableFromFrame()

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index 4f0b0390442d87dc8ba4f7a2446c502116ce68ed..203a9962d592e770c6a2ad8bcd7b94e2db6c6158 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -232,7 +232,8 @@ void CodeGenerator::RecordSafepoint(ReferenceMap* references,
 bool CodeGenerator::IsMaterializableFromFrame(Handle<HeapObject> object,
                                               int* offset_return) {
   if (linkage()->GetIncomingDescriptor()->IsJSFunctionCall()) {
-    if (object.is_identical_to(info()->context()) && !info()->is_osr()) {
+    if (info()->has_context() && object.is_identical_to(info()->context()) &&
+        !info()->is_osr()) {
       *offset_return = StandardFrameConstants::kContextOffset;
       return true;
     } else if (object.is_identical_to(info()->closure())) {
@@ -531,6 +532,7 @@ void CodeGenerator::BuildTranslationForFrameStateDescriptor(
 
   Handle<SharedFunctionInfo> shared_info;
   if (!descriptor->shared_info().ToHandle(&shared_info)) {
+    if (!info()->parse_info()) return;  // TODO(titzer): that was unfortunate.

[Michael Starzinger, 2015/08/14 11:52:38]

nit: Can we use has_shared_info() here instead? We shouldn't need to care about
the ParseInfo vs. CompilationInfo madness here.

Also is it really safe to just bailout here without building a translation?

     shared_info = info()->shared_info();
   }
   int shared_info_id = DefineDeoptimizationLiteral(shared_info);