Remove redundant definition of SYMBOL_NAME macro

Author: mintsuki

int_lib.h

@@ -39,10 +39,6 @@
 #define NORETURN __attribute__((noreturn))
 #define UNUSED __attribute__((unused))
 
-#define STR(a) #a
-#define XSTR(a) STR(a)
-#define SYMBOL_NAME(name) XSTR(__USER_LABEL_PREFIX__) #name
-
 #define COMPILER_RT_ALIAS(name, aliasname) \
   COMPILER_RT_ABI __typeof(name) aliasname __attribute__((__alias__(#name)));