Don't create null guards for values that are already known to be non-null.
remove unreferenced local variable in gpu_ptx.cpp
get holder class from metaspace method when resolving MemberName target method; not necessarily the same as MemberName.clazz

--HG--
extra : histedit_source : 26ce2d20397d4f58c0f3d261acb29e1bee882ed9
remove duplicate code in VMToCompilerImpl.compileMethod

--HG--
extra : histedit_source : 8f6538ce519f54976fce278291a358831a5a76e6