[clang] [HLSL] Implement output parameter (PR #101083)

[John McCall via cfe-commits]

================
@@ -4148,6 +4152,30 @@ static void emitWriteback(CodeGenFunction &CGF,
   assert(!isProvablyNull(srcAddr.getBasePointer()) &&
          "shouldn't have writeback for provably null argument");
 
+  if (CGF.getLangOpts().HLSL) {
+    if (!isa<OpaqueValueExpr>(writeback.CastExpr)) {
+      RValue TmpVal = CGF.EmitAnyExprToTemp(writeback.CastExpr);
+      if (TmpVal.isScalar())
+        CGF.EmitStoreThroughLValue(TmpVal, srcLV);
----------------
rjmccall wrote:

You're missing the `_Complex` case here.

https://github.com/llvm/llvm-project/pull/101083
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