Reland initial bits of "Implement correct OS and CC detection."

src/checks.h

Index: src/checks.h
diff --git a/src/checks.h b/src/checks.h
index b309e2c42c79361b53d7eacaaf6d75028d1a64d5..1feecf3a928364218eb9c9545d87c094cdfbc22e 100644
--- a/src/checks.h
+++ b/src/checks.h
@@ -30,6 +30,8 @@
 
 #include <string.h>
 
+#include "globals.h"
+
 #include "../include/v8stdint.h"
 extern "C" void V8_Fatal(const char* file, int line, const char* format, ...);
 
@@ -232,7 +234,7 @@ inline void CheckNonEqualsHelper(const char* file,
 
 // Use C++11 static_assert if possible, which gives error
 // messages that are easier to understand on first sight.
-#if __cplusplus >= 201103L
+#if V8_CXX_STATIC_ASSERT
 #define STATIC_CHECK(test) static_assert(test, #test)
 #else
 // This is inspired by the static assertion facility in boost.  This
@@ -254,7 +256,7 @@ template <int> class StaticAssertionHelper { };
   typedef                                                                     \
     StaticAssertionHelper<sizeof(StaticAssertion<static_cast<bool>((test))>)> \
     SEMI_STATIC_JOIN(__StaticAssertTypedef__, __LINE__)
-#endif
+#endif  // V8_CXX_STATIC_ASSERT
 
 
 extern bool FLAG_enable_slow_asserts;