Commits on Aug 4, 2024

1. When deduplicating unreachable blocks, erase the source information. …

   After deduplication the block conceptually belongs to multiple locations
   in the source. Although these blocks are unreachable, in rust-lang#123341 we did
   come across a real side effect, an unreachable block that survives into
   the compiled code can cause a debugger to set a breakpoint on the wrong
   instruction. Erasing the source information ensures that a debugger will
   never be misled into thinking that the unreachable block is worth setting
   a breakpoint on, especially after rust-lang#128627.
   
   Technically we don't need to erase the source information if all the
   deduplicated blocks have identical source information, but tracking
   that seems like more effort than it's worth.

   

   khuey committed Aug 4, 2024
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