DNMD

Provide single-threaded (no-locking) implementation of IMetadataEmit … #259

Job	Run time
Build (windows-latest, Debug, Single Build = true)	20m 50s
Build (windows-latest, Debug, Single Build = false)	15m 32s
Build (windows-latest, Release, Single Build = true)	11m 53s
Build (windows-latest, Release, Single Build = false)	10m 44s
Build (macos-latest, Debug, Single Build = true)	1m 23s
Build (macos-latest, Debug, Single Build = false)	1m 21s
Build (macos-latest, Release, Single Build = true)	2m 17s
Build (macos-latest, Release, Single Build = false)	1m 23s
Build (ubuntu-latest, Debug, Single Build = true)	1m 54s
Build (ubuntu-latest, Debug, Single Build = false)	2m 7s
Build (ubuntu-latest, Release, Single Build = true)	2m 57s
Build (ubuntu-latest, Release, Single Build = false)	2m 27s
	1h 14m 48s

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