Augie Fackler 1f33911f50 IRBuilder: avoid crash when seeking to start of a BasicBlock with only DebugInfo (#66266) ...

This fixes a crash in `rustc` that was triggered by
https://reviews.llvm.org/D159485 (aka
llvm/llvm-project@1ce1732f82).

This was more or less pair-programmed with @krasimirgg - I can't claim
full credit.

2023-09-15 12:52:07 -04:00

35 KiB

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