Sergei Barannikov c3959f22ab [MachineLICM] Remove CurPreheader parameter that is always nullptr (#135554) ...

Also, rename `getCurPreheader` -> `getOrCreatePreheader` to make it
clear that this method may alter CFG.

Update `Changed` if the method modified a loop by splitting a critical
edge (this change is not strictly NFC).

The removed parameter was probably intended to save compile time by not
trying to a critical edge after the first attempt has failed, but it is
only tried once per loop.

PR: https://github.com/llvm/llvm-project/pull/135554

2025-04-15 05:03:33 +03:00

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