Try to speed up gccld hot spot in BasicVN::getEqualNumberNodes by making

Try to speed up gccld hot spot in BasicVN::getEqualNumberNodes by making
a function call at the core of the loop inline and removing unused
stack variables from an often called function. This doesn't improve things
much, the real saving will be by reducing the number of calls to this
function (100K+ when linking kimwitu++).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19119 91177308-0d34-0410-b5e6-96231b3b80d8