Reland "ARM64: Add NEON support"

src/crankshaft/arm64/lithium-gap-resolver-arm64.h

Index: src/crankshaft/arm64/lithium-gap-resolver-arm64.h
diff --git a/src/crankshaft/arm64/lithium-gap-resolver-arm64.h b/src/crankshaft/arm64/lithium-gap-resolver-arm64.h
index 31dbf30a8aa346d695da6b495d4d04f8306aef32..28f0990fe2c3d8a701254f06bb4f8dba70c78020 100644
--- a/src/crankshaft/arm64/lithium-gap-resolver-arm64.h
+++ b/src/crankshaft/arm64/lithium-gap-resolver-arm64.h
@@ -68,7 +68,7 @@ class LGapResolver BASE_EMBEDDED {
   // These two methods switch from one mode to the other.
   void AcquireSavedValueRegister() { masm_.AcquireScratchRegister(); }
   void ReleaseSavedValueRegister() { masm_.ReleaseScratchRegister(); }
-  const FPRegister& SavedFPValueRegister() {
+  const VRegister& SavedFPValueRegister() {
     // We use the Crankshaft floating-point scratch register to break a cycle
     // involving double values as the MacroAssembler will not need it for the
     // operations performed by the gap resolver.