[5.3] [CS] Emit syntactic diagnostics for for loop where clauses #33041
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5.3 cherry-pick of #33037, minus the last commit which is just a refactor.
Explanation: Fixes a 5.3 regression where we would fail to emit a group of diagnostics for the
where
clause of a for loop.Scope: Fixes a 5.3 regression that could allow us to accept invalid code.
Radar: rdar://65903005
Risk: Low, this re-enables diagnostic logic that was previously enabled in 5.2.
Testing: Added unit test.
Reviewer: @xedin.