[6.0] Fix lifetime dependence demangling and add a new Sema diagnostic #73003
+51
−14
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Explanation: [6.0] Fix lifetime dependence demangling and add a new Sema diagnostic
Scope: Required when lifetime dependence specifiers are used alongside some other type annotations like
throws
Radar/SR Issues: rdar://125564108 (~Escapable: Assertion in demangler instead of diagnostic)
Original PR: #72684
Risk: The changes are effective only with the experimental feature non escapable types
Testing: Unit tests added
Reviewer: @atrick