Upgrade V8 to 5.1.281.57  DO NOT MERGE

FPIIM-449

Change-Id: Id981b686b4d587ac31697662eb98bb34be42ad90
(cherry picked from commit 3b9bc31999c9787eb726ecdbfd5796bfdec32a18)
diff --git a/src/compiler/arm/instruction-codes-arm.h b/src/compiler/arm/instruction-codes-arm.h
index 50fa555..5e6f5c9 100644
--- a/src/compiler/arm/instruction-codes-arm.h
+++ b/src/compiler/arm/instruction-codes-arm.h
@@ -46,6 +46,12 @@
   V(ArmUxtab)                      \
   V(ArmRbit)                       \
   V(ArmUxtah)                      \
+  V(ArmAddPair)                    \
+  V(ArmSubPair)                    \
+  V(ArmMulPair)                    \
+  V(ArmLslPair)                    \
+  V(ArmLsrPair)                    \
+  V(ArmAsrPair)                    \
   V(ArmVcmpF32)                    \
   V(ArmVaddF32)                    \
   V(ArmVsubF32)                    \