[arm] Clean up use of IsSupported and IsEnabled.

src/arm/codegen-arm.cc

Index: src/arm/codegen-arm.cc
diff --git a/src/arm/codegen-arm.cc b/src/arm/codegen-arm.cc
index 75801454e8165f998db0e5f28fc6ae6d00d0fdae..e63da5c766c8f87c4c828b87c2cb9ff5ec46fec5 100644
--- a/src/arm/codegen-arm.cc
+++ b/src/arm/codegen-arm.cc
@@ -39,6 +39,7 @@ MemCopyUint8Function CreateMemCopyUint8Function(Isolate* isolate,
   Label less_4;
 
   if (CpuFeatures::IsSupported(NEON)) {
+    CpuFeatureScope scope(&masm, NEON);
     Label loop, less_256, less_128, less_64, less_32, _16_or_less, _8_or_less;
     Label size_less_than_8;
     __ pld(MemOperand(src, 0));
@@ -193,6 +194,7 @@ MemCopyUint16Uint8Function CreateMemCopyUint16Uint8Function(
   Register src = r1;
   Register chars = r2;
   if (CpuFeatures::IsSupported(NEON)) {
+    CpuFeatureScope scope(&masm, NEON);
     Register temp = r3;
     Label loop;