[NFC] More prep work for sharing code between param and result reabstraction

Author: rjmccall

lib/SILGen/SILGenBackDeploy.cpp

@@ -190,14 +190,14 @@ void SILGenFunction::emitBackDeploymentThunk(SILDeclRef thunk) {
 
   // Generate the thunk prolog by collecting parameters.
   SmallVector<ManagedValue, 4> params;
-  SmallVector<SILArgument *, 4> indirectParams;
+  SmallVector<ManagedValue, 4> indirectParams;
   collectThunkParams(loc, params, &indirectParams);
 
   // Build up the list of arguments that we're going to invoke the the real
   // function with.
   SmallVector<SILValue, 8> paramsForForwarding;
   for (auto indirectParam : indirectParams) {
-    paramsForForwarding.emplace_back(indirectParam);
+    paramsForForwarding.emplace_back(indirectParam.getLValueAddress());
   }
 
   for (auto param : params) {

lib/SILGen/SILGenFunction.h

@@ -2252,7 +2252,7 @@ class LLVM_LIBRARY_VISIBILITY SILGenFunction
   /// Used for emitting SILArguments of bare functions, such as thunks.
   void collectThunkParams(
       SILLocation loc, SmallVectorImpl<ManagedValue> &params,
-      SmallVectorImpl<SILArgument *> *indirectResultParams = nullptr);
+      SmallVectorImpl<ManagedValue> *indirectResultParams = nullptr);
 
   /// Build the type of a function transformation thunk.
   CanSILFunctionType buildThunkType(CanSILFunctionType &sourceType,