[arm] Clean up use of IsSupported and IsEnabled.

src/arm/assembler-arm.h

Index: src/arm/assembler-arm.h
diff --git a/src/arm/assembler-arm.h b/src/arm/assembler-arm.h
index 83afcae2788794175c8d05a96f1265c5d3c64836..e5448f79aeb34d9ce24e07cb0f8582317c6d9e8b 100644
--- a/src/arm/assembler-arm.h
+++ b/src/arm/assembler-arm.h
@@ -1603,6 +1603,12 @@ class Assembler : public AssemblerBase {
            (pc_offset() < no_const_pool_before_);
   }
 
+  bool VfpRegisterIsAvailable(DwVfpRegister reg) {
+    DCHECK(reg.is_valid());
+    return IsEnabled(VFP32DREGS) ||
+           (reg.reg_code < LowDwVfpRegister::kMaxNumLowRegisters);
+  }
+
  private:
   int next_buffer_check_;  // pc offset of next buffer check