Derek Schuff fe990b9005 [WebAssembly] DebugValueManager ctor: scan only uses instead of whole BB (#188871) ...

The DebugValueManager constructor scans the basic block to find all DEBUG_VALUE
uses of a def. This can lead to quadratic behavior as reported in #168326.
Instead, use MRI.use_instructions to find only the def's uses to limit the
search.
We still scan the BB so that we get the uses in order, and so we can stop
when a new def is found.

2026-03-27 09:05:48 -07:00

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