ARM64: Support vectorization for double and long.

Test: test-art-host, test-art-target
Change-Id: I1d4db1763b64737766f9756e5d0f85c5736e3522
diff --git a/compiler/optimizing/common_arm64.h b/compiler/optimizing/common_arm64.h
index 5372b97..721f74e 100644
--- a/compiler/optimizing/common_arm64.h
+++ b/compiler/optimizing/common_arm64.h
@@ -97,6 +97,11 @@
   return vixl::aarch64::FPRegister::GetQRegFromCode(location.reg());
 }
 
+inline vixl::aarch64::FPRegister VRegisterFrom(Location location) {
+  DCHECK(location.IsFpuRegister()) << location;
+  return vixl::aarch64::FPRegister::GetVRegFromCode(location.reg());
+}
+
 inline vixl::aarch64::FPRegister SRegisterFrom(Location location) {
   DCHECK(location.IsFpuRegister()) << location;
   return vixl::aarch64::FPRegister::GetSRegFromCode(location.reg());