[SourceKit] Don't use clang build sessions when validation is disabled #31013
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Don't use
-fbuild-session-timestamp
if-disable-modules-validate-system-headers
is specified.Since system header validation happens under OR condition of
ValidateSystemInputs
andModulesValidateOncePerBuildSession
, using build sessions effectively overrides-disable-modules-validate-system-headers
.rdar://problem/61075677