Jeremy Morse 056a3f4673 [NFC] Reapply 3f37c517f, SmallDenseMap speedups ...

This time with 100% more building unit tests. Original commit message follows.

[NFC] Switch a number of DenseMaps to SmallDenseMaps for speedup (#109417)

If we use SmallDenseMaps instead of DenseMaps at these locations,
we get a substantial speedup because there's less spurious malloc
traffic. Discovered by instrumenting DenseMap with some accounting
code, then selecting sites where we'll get the most bang for our buck.

2024-09-26 10:49:29 +01:00

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