PPC: [runtime] Unify and simplify how frames are marked

src/ppc/deoptimizer-ppc.cc

 // Copyright 2014 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/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/register-configuration.h"
 #include "src/safepoint-table.h"
 
@@ skipping 144 matching lines @@
   // address for lazy deoptimization) and compute the fp-to-sp delta in
   // register r7.
   __ mflr(r6);
   // Correct one word for bailout id.
   __ addi(r7, sp, Operand(kSavedRegistersAreaSize + (1 * kPointerSize)));
   __ sub(r7, fp, r7);
 
   // Allocate a new deoptimizer object.
   // Pass six arguments in r3 to r8.
   __ PrepareCallCFunction(6, r8);
+  __ li(r3, Operand::Zero());
+  Label context_check;
+  __ LoadP(r4, MemOperand(fp, CommonFrameConstants::kContextOrFrameTypeOffset));
+  __ JumpIfSmi(r4, &context_check);
   __ LoadP(r3, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
+  __ bind(&context_check);
   __ li(r4, Operand(type()));  // bailout type,
   // r5: bailout id already loaded.
   // r6: code address or 0 already loaded.
   // r7: Fp-to-sp delta.
   __ mov(r8, Operand(ExternalReference::isolate_address(isolate())));
   // Call Deoptimizer::New().
   {
     AllowExternalCallThatCantCauseGC scope(masm());
     __ CallCFunction(ExternalReference::new_deoptimizer_function(isolate()), 6);
   }
@@ skipping 153 matching lines @@
 
 void FrameDescription::SetCallerConstantPool(unsigned offset, intptr_t value) {
   DCHECK(FLAG_enable_embedded_constant_pool);
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8