gcc-plugins: Rename last_stmt() for GCC 14+

In GCC 14, last_stmt() was renamed to last_nondebug_stmt(). Add a helper
macro to handle the renaming.

Cc: linux-hardening@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

scripts/gcc-plugins/gcc-common.h

@@ -440,4 +440,8 @@ static inline void debug_gimple_stmt(const_gimple s)
 #define SET_DECL_MODE(decl, mode)	DECL_MODE(decl) = (mode)
 #endif
 
+#if BUILDING_GCC_VERSION >= 14000
+#define last_stmt(x)			last_nondebug_stmt(x)
+#endif
+
 #endif