Revert "Disable clang compiler for the mips target."

This reverts commit 855b9b56aa4199f22a57f1d03ed13da73e685255.

BUG: 18789639

Change-Id: I2283c123f2a260a089d5b7c2722fcbd96313c95e
diff --git a/Android.libv8.mk b/Android.libv8.mk
index b167898..41815ce 100644
--- a/Android.libv8.mk
+++ b/Android.libv8.mk
@@ -107,11 +107,6 @@
 # expected compatible register, symbol or integer in range [0, 4095]
 LOCAL_CLANG_CFLAGS_arm64 += -no-integrated-as
 
-# mark-compact.cc has error: macro used $at after ".set noat"
-ifeq ($(TARGET_ARCH),mips)
-    LOCAL_CLANG := false
-endif
-
 LOCAL_CFLAGS_mips += -DV8_TARGET_ARCH_MIPS \
 	-Umips \
 	-finline-limit=64 \