Use __predict_false on some fortify methods.

Give the compiler some hints that these error conditions
are unlikely to occur in practice.

Change-Id: Ifaf7322a12120ef663c8315c1a18c2dcbe4bda23

libc/bionic/__strlcat_chk.cpp

@@ -45,7 +45,7 @@
 extern "C" size_t __strlcat_chk(char *dest, const char *src,
               size_t supplied_size, size_t dest_len_from_compiler)
 {
-    if (supplied_size > dest_len_from_compiler) {
+    if (__predict_false(supplied_size > dest_len_from_compiler)) {
         __fortify_chk_fail("strlcat buffer overflow", 0);
     }