Add `custom_insts` for our own `OpExtInst`s, and use it for some debuginfo.#1064

Merged

eddyb merged 11 commits intoEmbarkStudios:mainfrom LykenSol:extinst

Jun 1, 2023

+1,406-389

Commits on Jun 1, 2023

Rename decorations to custom_decorations.
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linker/zombies: keep &Instruction for OpLine, instead of extracting operands.
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linker/dce: use FxIndexSet instead of FxHashSet for the "roots" set.
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Add custom_insts for our own OpExtInsts, and use it for some debuginfo.
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custom_insts: make SetDebugSrcLoc have a range instead of just the starting location.
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entry: fix entry-point stub spans (to point to the actual fn name).
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Preserve all intra-function annotations in both specializer and inline.
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spirt_passes/diagnostics: also recover zombie Spans from their own attrs.
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spirt_passes/diagnostics: track uses of global variables more accurately.
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custom_inst: add {Push,Pop}InlinedCallFrame and emit them in the inliner.
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Add CHANGELOG entry for custom OpExtInsts.
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