ConstExpr: look through sendable function conversions

Author: eeckstein

lib/SILOptimizer/Utils/ConstExpr.cpp

@@ -520,7 +520,7 @@ SymbolicValue ConstExprFunctionState::computeConstantValue(SILValue value) {
   // TODO: Certain covariant or otherwise ABI-compatible conversions should
   // be handled as well.
   if (auto cf = dyn_cast<ConvertFunctionInst>(value)) {
-    if (cf->onlyConvertsSubstitutions()) {
+    if (cf->onlyConvertsSubstitutions() || cf->onlyConvertsSendable()) {
       return getConstantValue(cf->getOperand());
     }
   }

test/SILOptimizer/constant_evaluable_profiler_test.swift

@@ -1,5 +1,5 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend -profile-generate -emit-silgen -primary-file %S/Inputs/constant_evaluable.swift -o %t/constant_evaluable_profiler_test_silgen.sil
+// RUN: %target-swift-frontend -profile-generate -enable-upcoming-feature InferSendableFromCaptures -emit-silgen -primary-file %S/Inputs/constant_evaluable.swift -o %t/constant_evaluable_profiler_test_silgen.sil
 //
 // Run the (mandatory) passes on which constant evaluator depends, and test the
 // constant evaluator on the SIL produced after the dependent passes are run.

test/SILOptimizer/constant_evaluable_subset_test.swift

@@ -1,5 +1,5 @@
 // RUN: %empty-directory(%t)
-// RUN: %target-swift-frontend -emit-silgen -primary-file %S/Inputs/constant_evaluable.swift -o %t/constant_evaluable_subset_test_silgen.sil
+// RUN: %target-swift-frontend -enable-upcoming-feature InferSendableFromCaptures -emit-silgen -primary-file %S/Inputs/constant_evaluable.swift -o %t/constant_evaluable_subset_test_silgen.sil
 //
 // Run the (mandatory) passes on which constant evaluator depends, and test the
 // constant evaluator on the SIL produced after the dependent passes are run.