[MachineSink] Use SmallDenseMap (NFC) #95676
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The use of SmallDenseMap saves 0.39% of heap allocations during the compilation of a large preprocessed file, namely X86ISelLowering.cpp, for the X86 target.
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The use of SmallDenseMap saves 0.39% of heap allocations during the
compilation of a large preprocessed file, namely X86ISelLowering.cpp,
for the X86 target.