Compiler Attributes: remove uses of __attribute__ from compiler.h

Suggested-by: Nick Desaulniers <[e-mail]>
Tested-by: Sedat Dilek <[e-mail]> # on top of v4.19-rc5, clang 7
Reviewed-by: Nick Desaulniers <[e-mail]>
Reviewed-by: Luc Van Oostenryck <[e-mail]>
Signed-off-by: Miguel Ojeda <[e-mail]>

include/linux/compiler.h

···
 #define __branch_check__(x, expect, is_constant) ({			\
 			long ______r;					\
 			static struct ftrace_likely_data		\
-				__attribute__((__aligned__(4)))		\
-				__attribute__((__section__("_ftrace_annotated_branch"))) \
+				__aligned(4)				\
+				__section("_ftrace_annotated_branch")	\
 				______f = {				\
 				.data.func = __func__,			\
 				.data.file = __FILE__,			\
···
 	({								\
 		int ______r;						\
 		static struct ftrace_branch_data			\
-			__attribute__((__aligned__(4)))			\
-			__attribute__((__section__("_ftrace_branch")))	\
+			__aligned(4)					\
+			__section("_ftrace_branch")			\
 			______f = {					\
 				.func = __func__,			\
 				.file = __FILE__,			\
···
 	extern typeof(sym) sym;					\
 	static const unsigned long __kentry_##sym		\
 	__used							\
-	__attribute__((__section__("___kentry" "+" #sym )))	\
+	__section("___kentry" "+" #sym )			\
 	= (unsigned long)&sym;
 #endif
 
···
  * visible to the compiler.
  */
 #define __ADDRESSABLE(sym) \
-	static void * __attribute__((__section__(".discard.addressable"), used)) \
+	static void * __section(".discard.addressable") __used \
 		__PASTE(__addressable_##sym, __LINE__) = (void *)&sym;
 
 /**