[5.7] New: Update incremental build hash to encode option arguments a… #1133
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Cherry-pick of #1128 to release branch
Explanation: Before this change, changing the argument to an option which affects incremental builds, or the relative ordering of multiple options affecting incremental builds won't correctly rebuild all of the sources. Update the argsHash computation to take order and arguments into account.
Scope: Affects incremental builds after driver CLI arguments are changed manually or by a build system.
Risk: Low
Reviewers: @artemcm
Testing: Added unit test coverage to the incremental builds suite
Issue: rdar://96556787