Drop unused and undocumented dummy_ from SaveContext.

Also remove the obsolte __GNUC_VERSION__ #define.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/23522003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16385 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/isolate-inl.h

@@ -39,9 +39,6 @@ namespace internal {
 SaveContext::SaveContext(Isolate* isolate) : prev_(isolate->save_context()) {
   if (isolate->context() != NULL) {
     context_ = Handle<Context>(isolate->context());
-#if __GNUC_VERSION__ >= 40100 && __GNUC_VERSION__ < 40300
-    dummy_ = Handle<Context>(isolate->context());
-#endif
   }
   isolate->set_save_context(this);
 

src/isolate.h

@@ -1406,9 +1406,6 @@ class SaveContext BASE_EMBEDDED {
 
  private:
   Handle<Context> context_;
-#if __GNUC_VERSION__ >= 40100 && __GNUC_VERSION__ < 40300
-  Handle<Context> dummy_;
-#endif
   SaveContext* prev_;
   Address c_entry_fp_;
 };

src/platform.h

@@ -58,13 +58,6 @@ int signbit(double x);
 # endif
 #endif
 
-// GCC specific stuff
-#ifdef __GNUC__
-
-#define __GNUC_VERSION__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
-
-#endif  // __GNUC__
-
 // Microsoft Visual C++ specific stuff.
 #if V8_CC_MSVC