ARM64: Support 128-bit registers for SIMD.

Test: test-art-host, test-art-target

Change-Id: Ifb931a99d34ea77602a0e0781040ed092de9faaa
diff --git a/compiler/optimizing/common_arm64.h b/compiler/optimizing/common_arm64.h
index d3f431e..5372b97 100644
--- a/compiler/optimizing/common_arm64.h
+++ b/compiler/optimizing/common_arm64.h
@@ -92,6 +92,11 @@
   return vixl::aarch64::FPRegister::GetDRegFromCode(location.reg());
 }
 
+inline vixl::aarch64::FPRegister QRegisterFrom(Location location) {
+  DCHECK(location.IsFpuRegister()) << location;
+  return vixl::aarch64::FPRegister::GetQRegFromCode(location.reg());
+}
+
 inline vixl::aarch64::FPRegister SRegisterFrom(Location location) {
   DCHECK(location.IsFpuRegister()) << location;
   return vixl::aarch64::FPRegister::GetSRegFromCode(location.reg());