SIL verification: non-address partial apply callee

Author: atrick

lib/SIL/Verifier/SILVerifier.cpp

@@ -1932,6 +1932,10 @@ class SILVerifier : public SILVerifierBase<SILVerifier> {
     require(resultInfo->getExtInfo().hasContext(),
             "result of closure cannot have a thin function type");
 
+    // We rely on all indirect captures to be in the argument list.
+    require(PAI->getCallee()->getType().isObject(),
+            "Closure callee must not be an address type.");
+
     checkApplyTypeDependentArguments(PAI);
 
     auto substTy = checkApplySubstitutions(PAI->getSubstitutionMap(),