[6.0] Accept borrowing
in pattern matches without underscore.
#72996
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Explanation: Allows borrowing x in addition to _borrowing x in pattern matches when the BorrowingSwitch experimental feature flag is enabled.
Scope: New feature enablement
Issue: rdar://126305009
Original PR: #72995
Risk: Low. The new syntax is enabled in a way that should keep the keyword usage contextual so that existing code does not break.
Testing: Swift CI, compatibility test suite
Reviewer: @atrick