[NVPTX] Switch from StrongPHIElimination to PHIElimination in NVPTXTargetMachine, and add some missing optimization passes to addOptimizedRegAlloc

Fixes PR17529

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192445 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed