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

src/compiler.h

 // 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.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 136 matching lines @@
   bool is_native() const;
   bool is_module() const;
   LanguageMode language_mode() const;
   Handle<JSFunction> closure() const;
   FunctionLiteral* function() const;
   Scope* scope() const;
   bool MayUseThis() const;
   Handle<Context> context() const;
   Handle<SharedFunctionInfo> shared_info() const;
   bool has_shared_info() const;
+  bool has_context() const;
   // -----------------------------------------------------------
 
   Isolate* isolate() const {
     return isolate_;
   }
   Zone* zone() { return zone_; }
   bool is_osr() const { return !osr_ast_id_.IsNone(); }
   Handle<Code> code() const { return code_; }
   CodeStub* code_stub() const { return code_stub_; }
   BailoutId osr_ast_id() const { return osr_ast_id_; }
@@ skipping 532 matching lines @@
   Zone zone_;
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_