ANDROID: kallsyms: strip hashes from function names with ThinLTO

With CONFIG_THINLTO and CFI both enabled, LLVM appends a hash to the
names of all static functions. This breaks userspace tools, so strip
out the hash from output.

Bug: 147422318
Change-Id: Ibea6be089d530e92dcd191481cb02549041203f6
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

kernel/kallsyms.c

@@ -314,6 +314,12 @@ static inline void cleanup_symbol_name(char *s)
 {
 	char *res;
 
+#ifdef CONFIG_THINLTO
+	/* Filter out hashes from static functions */
+	res = strrchr(s, '$');
+	if (res)
+		*res = '\0';
+#endif
 	res = strrchr(s, '.');
 	if (res && !strcmp(res, ".cfi"))
 		*res = '\0';