Remove (untested) code for unsupported compilers.

test/cctest/test-log-stack-tracer.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 217 matching lines @@
   unsigned base = 0;
   CHECK_GT(sample.frames_count, base + 1);
   CHECK(IsAddressWithinFuncCode(context, "JSTrace", sample.stack[base + 0]));
   CHECK(IsAddressWithinFuncCode(
       context, "OuterJSTrace", sample.stack[base + 1]));
 }
 
 
 static void CFuncDoTrace(byte dummy_parameter) {
   Address fp;
-#ifdef __GNUC__
+#if V8_HAS_BUILTIN_FRAME_ADDRESS
   fp = reinterpret_cast<Address>(__builtin_frame_address(0));
-#elif defined _MSC_VER
+#elif V8_CC_MSVC
   // Approximate a frame pointer address. We compile without base pointers,
   // so we can't trust ebp/rbp.
   fp = &dummy_parameter - 2 * sizeof(void*);  // NOLINT
 #else
 #error Unexpected platform.
 #endif
   i::TraceExtension::DoTrace(fp);
 }
 
 
@@ skipping 26 matching lines @@
   v8::Local<v8::Context> context = CcTest::NewContext(TRACE_EXTENSION);
   v8::Context::Scope context_scope(context);
   CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
   CompileRun("a = 1; b = a + 1;");
   CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
   CompileRun("js_entry_sp();");
   CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
   CompileRun("js_entry_sp_level2();");
   CHECK_EQ(0, i::TraceExtension::GetJsEntrySp());
 }