More -fsanitize=vptr fixes.

src/compiler/instruction-selector-impl.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 #define V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_
 
 #include "src/compiler/instruction.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
@@ skipping 320 matching lines @@
   Node* result_;             // Only valid if mode_ == kFlags_set.
   BasicBlock* true_block_;   // Only valid if mode_ == kFlags_branch.
   BasicBlock* false_block_;  // Only valid if mode_ == kFlags_branch.
 };
 
 
 // An internal helper class for generating the operands to calls.
 // TODO(bmeurer): Get rid of the CallBuffer business and make
 // InstructionSelector::VisitCall platform independent instead.
 struct CallBuffer {
-  CallBuffer(Zone* zone, CallDescriptor* descriptor,
+  CallBuffer(Zone* zone, const CallDescriptor* descriptor,
              FrameStateDescriptor* frame_state);
 
-  CallDescriptor* descriptor;
+  const CallDescriptor* descriptor;
   FrameStateDescriptor* frame_state_descriptor;
   NodeVector output_nodes;
   InstructionOperandVector outputs;
   InstructionOperandVector instruction_args;
   NodeVector pushed_nodes;
 
   size_t input_count() const { return descriptor->InputCount(); }
 
   size_t frame_state_count() const { return descriptor->FrameStateCount(); }
 
   size_t frame_state_value_count() const {
     return (frame_state_descriptor == NULL)
                ? 0
                : (frame_state_descriptor->GetTotalSize() +
                   1);  // Include deopt id.
   }
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_SELECTOR_IMPL_H_