Quentin Dian 86a78284e7 [TailDuplicator] Add maximum predecessors and successors to consider tail duplicating blocks (#78582) ...

Fixes #78578.

Duplicating a BB which has both multiple predecessors and successors
will result in a complex CFG and also may cause huge amount of PHI
nodes. See
https://github.com/llvm/llvm-project/issues/78578#issuecomment-1962363580
for a detailed description of the limit.

2024-04-17 20:27:09 +08:00

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