Backed out changeset 583284c299fb (bug 1091916) for causing intermittent "too much recursion" jit-test failures on Win32 and OSX 10.6.

CLOSED TREE

js/src/jsnativestack.h

@@ -18,7 +18,6 @@ inline uintptr_t
 GetNativeStackBase()
 {
     uintptr_t stackBase = reinterpret_cast<uintptr_t>(GetNativeStackBaseImpl());
-    MOZ_ASSERT(stackBase != 0);
     MOZ_ASSERT(stackBase % sizeof(void *) == 0);
     return stackBase;
 }