Rintaro Ishizaki f943a889ff [SourceKit] Don't use clang build sessions when validation is disabled ...

Don't use '-fbuild-session-timestamp' if
'-disable-modules-validate-system-headers' is specified.

Since system header validation happens under *OR* condition of
'ValidateSystemInputs' and 'ModulesValidateOncePerBuildSession', using
build sessions effectively overrides it.

rdar://problem/61075677

2020-04-14 17:38:10 +00:00

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