Compiler Attributes: fix __has_attribute(__no_sanitize_coverage__) for GCC 4

Fix __has_attribute(__no_sanitize_coverage__) for GCC 4 by defining
__GCC4_has_attribute___no_sanitize_coverage__.

Fixes: 540540d ("kcov: add __no_sanitize_coverage to fix noinstr for all architectures")
Reported-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Marco Elver <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>

Author: melver

include/linux/compiler_attributes.h

@@ -36,6 +36,7 @@
 # define __GCC4_has_attribute___nonstring__           0
 # define __GCC4_has_attribute___no_sanitize_address__ (__GNUC_MINOR__ >= 8)
 # define __GCC4_has_attribute___no_sanitize_undefined__ (__GNUC_MINOR__ >= 9)
+# define __GCC4_has_attribute___no_sanitize_coverage__ 0
 # define __GCC4_has_attribute___fallthrough__         0
 #endif