Avoid warning about our use of __builtin_frame_address.

gcc complains that passing any other value than 0 is unsafe and show be used only in debug situations

core/newdelete/src/MemCheck.cxx

@@ -492,6 +492,7 @@ static void *get_stack_pointer(int level)
 {
    void *p = 0;
 #if defined(R__GNU) && (defined(R__LINUX) || defined(R__HURD))
+#pragma GCC diagnostic ignored "-Wframe-address"
    switch (level) {
    case 0:
       if (__builtin_frame_address(1))

misc/memstat/inc/TMemStatBacktrace.h

@@ -11,6 +11,10 @@
 #ifndef ROOT_TMemStatBacktrace
 #define ROOT_TMemStatBacktrace
 
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wframe-address"
+#endif
+
 #define _INIT_TOP_STACK extern void *g_global_stack_end;
 #define _GET_CALLER_FRAME_ADDR g_global_stack_end = __builtin_frame_address(1);