Update aosp/master compiler-rt for rebase to r256229

http://b/26987366

Change-Id: I0ca3d7d3f1b7926fcffcb5b467e79958de576437
diff --git a/lib/builtins/comparedf2.c b/lib/builtins/comparedf2.c
index 64eea12..9e29752 100644
--- a/lib/builtins/comparedf2.c
+++ b/lib/builtins/comparedf2.c
@@ -80,6 +80,11 @@
     }
 }
 
+#if defined(__ELF__)
+// Alias for libgcc compatibility
+FNALIAS(__cmpdf2, __ledf2);
+#endif
+
 enum GE_RESULT {
     GE_LESS      = -1,
     GE_EQUAL     =  0,