Tim Northover a87d3ba61c Reapply: StackProtector: ignore debug insts when splitting blocks. ...

When deciding where to split a block to insert stack guard checks, we should
move past any debug instructions we see that might (e.g.) be separating a tail
call from its frame wrangling.

This time, also don't run off the front of a basic block.

2022-02-14 10:58:22 +00:00

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