Introduce CRT_HAS_128BIT, currently for all __LP64__ platforms.
Use it to enable the various functions for TI mode.

llvm-svn: 201909
diff --git a/compiler-rt/lib/builtins/lshrti3.c b/compiler-rt/lib/builtins/lshrti3.c
index be76814..6fc4e1f 100644
--- a/compiler-rt/lib/builtins/lshrti3.c
+++ b/compiler-rt/lib/builtins/lshrti3.c
@@ -14,7 +14,7 @@
 
 #include "int_lib.h"
 
-#if __x86_64
+#ifdef CRT_HAS_128BIT
 
 /* Returns: logical a >> b */
 
@@ -42,4 +42,4 @@
     return result.all;
 }
 
-#endif /* __x86_64 */ 
+#endif /* CRT_HAS_128BIT */