objtool: Only include valid definitions depending on source file type

Header include/linux/objtool.h contains both C and assembly definition that
are visible regardless of the file including them.

Place definition under conditional __ASSEMBLY__.
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>

include/linux/objtool.h

@@ -3,6 +3,8 @@
 #define _LINUX_OBJTOOL_H
 
 #ifdef CONFIG_STACK_VALIDATION
+
+#ifndef __ASSEMBLY__
 /*
  * This macro marks the given function's stack frame as "non-standard", which
  * tells objtool to ignore the function when doing stack metadata validation.
@@ -15,6 +17,8 @@
 	static void __used __section(.discard.func_stack_frame_non_standard) \
 		*__func_stack_frame_non_standard_##func = func
 
+#else /* __ASSEMBLY__ */
+
 /*
  * This macro indicates that the following intra-function call is valid.
  * Any non-annotated intra-function call will cause objtool to issue a warning.
@@ -25,6 +29,8 @@
 	.long 999b;						\
 	.popsection;
 
+#endif /* __ASSEMBLY__ */
+
 #else /* !CONFIG_STACK_VALIDATION */
 
 #define STACK_FRAME_NON_STANDARD(func)