[llvm-bugs] [Bug 39140] New: Improve 'collectDebugValues' algorithm.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39140

            Bug ID: 39140
           Summary: Improve 'collectDebugValues' algorithm.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: international.phantom at gmail.com
                CC: aprantl at apple.com, dblaikie at gmail.com,
                    ftee at flametop.co.uk, greg.bedwell at sony.com,
                    jeremy.morse.llvm at gmail.com, llvm-bugs at lists.llvm.org,
                    paul.robinson at am.sony.com, vsk at apple.com,
                    Wolfgang_Pieb at playstation.sony.com

During the review of

https://reviews.llvm.org/D50887

there were some discussion on the algorithm used by 'collectDebugValues':

https://reviews.llvm.org/D50887?id=161183#inline-448054

The idea was to use the list of USEs instead of linearily scanning through all
instructions.

https://reviews.llvm.org/D50887?id=161183#inline-448099

It was mentioned to use `MachineInstrIterator::use_instructions(Reg)`, with a
MRI object being available in the contexts where collecting debug values.

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