Jeremy Morse 4136897bd4 [DebugInfo][InstrRef][NFC] Switch to using DenseMaps and similar ...

There are a few STL containers hanging around that can become DenseMaps,
SmallVectors and similar. This recovers a modest amount of compile time
performance.

While I'm here, adjust the bit layout of ValueIDNum: this was always
supposed to act like a value type, however it seems that clang doesn't
compile the comparison functions to act that way. Add a uint64_t to a
union that explicitly aliases the bitfields, so that we can compare the
whole value as a single integer.

Differential Revision: https://reviews.llvm.org/D112333

2021-10-25 18:07:17 +01:00

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