[turbofan] Gracefully handle missing info()->context() in...

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

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1292233004

Cr-Commit-Position: refs/heads/master@{#30176}

src/compiler.cc

@@ -102,6 +102,11 @@ bool CompilationInfo::has_shared_info() const {
 }
 
 
+bool CompilationInfo::has_context() const {
+  return parse_info_ && !parse_info_->context().is_null();
+}
+
+
 CompilationInfo::CompilationInfo(ParseInfo* parse_info)
     : CompilationInfo(parse_info, nullptr, BASE, parse_info->isolate(),
                       parse_info->zone()) {

src/compiler.h

@@ -154,6 +154,7 @@ class CompilationInfo {
   Handle<Context> context() const;
   Handle<SharedFunctionInfo> shared_info() const;
   bool has_shared_info() const;
+  bool has_context() const;
   // -----------------------------------------------------------
 
   Isolate* isolate() const {

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()->has_shared_info()) return;  // Stub with no SharedFunctionInfo.
     shared_info = info()->shared_info();
   }
   int shared_info_id = DefineDeoptimizationLiteral(shared_info);