llvm dev - Jul 2021 - [DebugInfo] Introduce the RemoveRedundantDebugValues MIR Pass

Hi,

I am introducing you to a new LLVM MIR Pass that removes redundant DBG_VALUEs
that the LiveDebugVariables Pass may insert after the virtual register
rewriting. It has been implemented as https://reviews.llvm.org/D105279. A
similar Pass exists on the LLVM IR level (https://reviews.llvm.org/D71478). This
new Pass is being placed right after the register allocator, but if we find some
other place in the pipeline this could be useful, we can invoke it there as
well.
On the gdb-7.11 build (used as a testbed with -g -O2), the
RemoveRedundantDebugValues removed 15032 instructions, according to the LLVM
statistics.

The review process is almost done, so any thoughts on this?

Best,
Djordje

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