Fix the mangling algorithm #3305

Job	Run time
Determine compiler version from git tag	1s
Ubuntu dev container/Debug	32m 21s
Native: macos-13/debug/Ninja	55m 14s
Ubuntu dev container/Release	21m 46s
Native: macos-13/debug/Xcode	20m 36s
Native: macos-13/release/Ninja	31m 23s
Native: macos-13/release/Xcode	15m 9s
Native: ubuntu-latest/debug/Ninja	31m 33s
Native: ubuntu-latest/release/Ninja	20m 16s
Native: windows-latest/debug/Ninja	11m 40s
Native: windows-latest/release/Ninja	16m 41s
	4h 16m 40s

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