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When emitting optimization remarks, we test for the presence of instruction locations by testing for a valid llvm.dbg.cu annotation. This is slightly inefficient because we can simply ask whether the debug location we have is known or not. Additionally, if my current plan works, I will need to remove the llvm.dbg.cu annotation from the IL (or prevent it from being generated) when -Rpass is used without -g. In those cases, we'll want to generate line tables but we will want to prevent code generation from emitting DWARF code for them. Tested on x86_64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211204 91177308-0d34-0410-b5e6-96231b3b80d8