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8f0f458824
this patch disables the dead register elimination pass and the load/store pair optimization pass at -O0. The ILP optimizations don't require the optimization level to be checked because the call to addILPOpts is predicated with the necessary check. The AdvSIMDScalar pass is disabled by default at all optimization levels. This patch leaves that pass disabled by default. Also, move command-line options into ARM64TargetMachine.cpp and add a few additional flags to aid in debugging. This fixes an issue with the -debug-pass=Structure flag where passes were printed, but not actually run (i.e., AdvSIMDScalar pass). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208223 91177308-0d34-0410-b5e6-96231b3b80d8
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