Use correct define for identifying MSVC compiler

src/base/debug/stack_trace_win.cc

Index: src/base/debug/stack_trace_win.cc
diff --git a/src/base/debug/stack_trace_win.cc b/src/base/debug/stack_trace_win.cc
index 8333cd9ea8f327e09b0c0161d3aa0767c6350012..64e63091226891c004b19e0b748a3948e7e00703 100644
--- a/src/base/debug/stack_trace_win.cc
+++ b/src/base/debug/stack_trace_win.cc
@@ -168,7 +168,7 @@ void DisableSignalStackDump() {
 // 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
 
@@ -177,7 +177,7 @@ StackTrace::StackTrace() {
   count_ = CaptureStackBackTrace(0, arraysize(trace_), trace_, NULL);
 }
 
-#if defined(COMPILER_MSVC)
+#if defined(V8_CC_MSVC)
 #pragma optimize("", on)
 #endif