[embedded] Fix generic function skipping in PerfDiags, diagnose KeyPathInsts in closures #76464
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We were skipping some functions (generic, but fully specialized) in PerformanceDiagnostics, and that resulted in e.g. a KeyPathInst in a closure not being flagged. See the attached testcase, which ends up crashing the compiler in IRGen when an attempt to lower a KeyPathInst is made. Let's fix that.
rdar://135948987