inlined findAstNode() calls#4146
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See https://blog.demofox.org/2015/02/25/avoiding-the-performance-hazzards-of-stdfunction/ - similar to #3828.
Testing an
-O2build with--enable=all --inconclusiveonmame_regtestcode (with some additional local speed hacks applied as well as BoostSmallVector):GCC 11
32,597,380,507->22,418,156,771Clang 13
27,462,468,325->18,463,123,276