PerformanceDiagnostics: when checking closure values, look through convert_function

Author: eeckstein

lib/SILOptimizer/Mandatory/PerformanceDiagnostics.cpp

@@ -217,6 +217,8 @@ bool PerformanceDiagnostics::checkClosureValue(SILValue closure,
       closure = tfi->getOperand();
     } else if (auto *cp = dyn_cast<CopyValueInst>(closure)) {
       closure = cp->getOperand();
+    } else if (auto *cv = dyn_cast<ConvertFunctionInst>(closure)) {
+      closure = cv->getOperand();
     } else if (acceptFunctionArgs && isa<SILFunctionArgument>(closure)) {
       // We can assume that a function closure argument is already checked at
       // the call site.