hg: graal/graal-jvmci-8: Always check the type of CallingConvention.Type

[doug.simon at oracle.com]

Changeset: 0ab4d816a7f0
Author:    Tom Rodriguez <tom.rodriguez at oracle.com>
Date:      2016-01-22 14:05 -0800
URL:       http://hg.openjdk.java.net/graal/graal-jvmci-8/rev/0ab4d816a7f0

Always check the type of CallingConvention.Type

! jvmci/jdk.vm.ci.hotspot.aarch64/src/jdk/vm/ci/hotspot/aarch64/AArch64HotSpotRegisterConfig.java
! jvmci/jdk.vm.ci.hotspot.amd64/src/jdk/vm/ci/hotspot/amd64/AMD64HotSpotRegisterConfig.java
! jvmci/jdk.vm.ci.hotspot.sparc/src/jdk/vm/ci/hotspot/sparc/SPARCHotSpotRegisterConfig.java