Use correct define for identifying MSVC compiler

src/base/debug/stack_trace_win.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Slightly adapted for inclusion in V8.
 // Copyright 2016 the V8 project authors. All rights reserved.
 
 #include "src/base/debug/stack_trace.h"
 
 #include <windows.h>
@@ skipping 150 matching lines @@
 
 void DisableSignalStackDump() {
   g_dump_stack_in_signal_handler = false;
 }
 
 // Disable optimizations for the StackTrace::StackTrace function. It is
 // important to disable at least frame pointer optimization ("y"), since
 // that breaks CaptureStackBackTrace() and prevents StackTrace from working
 // in Release builds (it may still be janky if other frames are using FPO,
 // but at least it will make it further).
-#if defined(COMPILER_MSVC)
+#if defined(V8_CC_MSVC)
 #pragma optimize("", off)
 #endif
 
 StackTrace::StackTrace() {
   // When walking our own stack, use CaptureStackBackTrace().
   count_ = CaptureStackBackTrace(0, arraysize(trace_), trace_, NULL);
 }
 
-#if defined(COMPILER_MSVC)
+#if defined(V8_CC_MSVC)
 #pragma optimize("", on)
 #endif
 
 StackTrace::StackTrace(EXCEPTION_POINTERS* exception_pointers) {
   InitTrace(exception_pointers->ContextRecord);
 }
 
 StackTrace::StackTrace(const CONTEXT* context) { InitTrace(context); }
 
 void StackTrace::InitTrace(const CONTEXT* context_record) {
@@ skipping 48 matching lines @@
     (*os) << "\n";
     (*os) << "==== C stack trace ===============================\n";
     (*os) << "\n";
     OutputTraceToStream(trace_, count_, os);
   }
 }
 
 }  // namespace debug
 }  // namespace base
 }  // namespace v8