generate unique type guids only when necessary #9798

Job	Run time
ormolu	7s
build ucm (ubuntu-20.04)	2m 41s
build ucm (macOS-13)	12m 56s
build ucm (windows-2019)	6m 30s
run interpreter tests (ubuntu-20.04)	1m 6s
run transcripts (ubuntu-20.04)	24s
run interpreter tests (macos-13)	2m 29s
generate jit source	6s
run transcripts (macos-13)	40s
run transcripts (windows-2019)	43s
build jit binary / build jit binary (ubuntu-20.04)	15s
build jit binary / build jit binary (macOS-13)	17s
build jit binary / build jit binary (windows-2019)	18s
test jit / test jit (ubuntu-20.04)	6s
test jit / test jit (macOS-13)	12s
	28m 50s

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