Martin Sebor 5ccfd5f6d4 [SimplifyLibCalls] Optimize memchr() with known char+str and unknown length ...

If both the character and string are known, but the length
potentially isn't, we can optimize the memchr() call to a select
of either the known position of the character or null.

Split off from https://reviews.llvm.org/D122836.

2022-04-04 11:01:33 +02:00

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