core/cortex-m0: Remove noop
The pragma disables a warning and then immediately re-enables it, which
has no effect.
BRANCH=none
TEST=./util/compare_build.sh -b all -j 120
=> MATCH
@@ -47,12 +47,6 @@ void __attribute__((naked)) default_handler(void)
extern void stack_end(void); /* not technically correct, it's just a pointer */
extern void reset(void);
-#pragma GCC diagnostic push
-#if __GNUC__ >= 8
-#pragma GCC diagnostic ignored "-Wattribute-alias"
-#endif
-#pragma GCC diagnostic pop
-
#endif /* PASS 1 */
#if PASS == 2
