[NFC] Deduped async call emission code.

Previously the same code was used for saving values into the async
context.  Here, that code is extracted into a private method.

Author: nate-chandler

lib/IRGen/GenCall.cpp

@@ -1952,6 +1952,12 @@ class AsyncCallEmission final : public CallEmission {
                                    getCallee().getSubstitutions());
   }
 
+  void saveValue(ElementLayout layout, Explosion &explosion, bool isOutlined) {
+    Address addr = layout.project(IGF, context, /*offsets*/ llvm::None);
+    auto &ti = cast<LoadableTypeInfo>(layout.getType());
+    ti.initialize(IGF, explosion, addr, isOutlined);
+  }
+
 public:
   AsyncCallEmission(IRGenFunction &IGF, llvm::Value *selfValue, Callee &&callee)
       : CallEmission(IGF, selfValue, std::move(callee)) {
@@ -2000,18 +2006,12 @@ class AsyncCallEmission final : public CallEmission {
     for (unsigned index = 0, count = layout.getIndirectReturnCount();
          index < count; ++index) {
       auto fieldLayout = layout.getIndirectReturnLayout(index);
-      Address fieldAddr =
-          fieldLayout.project(IGF, context, /*offsets*/ llvm::None);
-      cast<LoadableTypeInfo>(fieldLayout.getType())
-          .initialize(IGF, llArgs, fieldAddr, isOutlined);
+      saveValue(fieldLayout, llArgs, isOutlined);
     }
     for (unsigned index = 0, count = layout.getArgumentCount(); index < count;
          ++index) {
       auto fieldLayout = layout.getArgumentLayout(index);
-      Address fieldAddr =
-          fieldLayout.project(IGF, context, /*offsets*/ llvm::None);
-      auto &ti = cast<LoadableTypeInfo>(fieldLayout.getType());
-      ti.initialize(IGF, llArgs, fieldAddr, isOutlined);
+      saveValue(fieldLayout, llArgs, isOutlined);
     }
     if (layout.hasBindings()) {
       auto bindingLayout = layout.getBindingsLayout();
@@ -2020,10 +2020,7 @@ class AsyncCallEmission final : public CallEmission {
     }
     if (selfValue) {
       auto fieldLayout = layout.getLocalContextLayout();
-      Address fieldAddr =
-          fieldLayout.project(IGF, context, /*offsets*/ llvm::None);
-      auto &ti = cast<LoadableTypeInfo>(fieldLayout.getType());
-      ti.initialize(IGF, llArgs, fieldAddr, isOutlined);
+      saveValue(fieldLayout, llArgs, isOutlined);
     }
   }
   void emitCallToUnmappedExplosion(llvm::CallInst *call, Explosion &out) override {