[llvm] [SDAG] Add missing float type legalizations for FMODF (PR #128055)

[Benjamin Maxwell via llvm-commits]

================
@@ -2616,6 +2624,18 @@ bool SelectionDAG::expandMultipleResultFPLibCall(
 
   auto [Call, CallChain] = TLI->LowerCallTo(CLI);
 
+  if (CallRetResNo && !Node->hasAnyUseOfValue(*CallRetResNo)) {
+    // This is needed for x87, which uses a floating-point stack. If (for
----------------
MacDue wrote:

>  If you want to land this without going deeper, please leave a comment referencing this conversation in the code, so if someone revisits later they have context.

Thanks :+1: I'll have to look into moving the `copy_from_reg` nodes into the `callseq_begin`, `callseq_end` pair tomorrow. If that turns out to be more complex than I hope, I will leave this for now and create a GitHub issue to link back to. 

https://github.com/llvm/llvm-project/pull/128055