[llvm] [MIPS] Fix -msingle-float doesn't work with double on O32 (PR #107543)

[via llvm-commits]

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@@ -1244,6 +1244,12 @@ SDValue MipsSETargetLowering::lowerBITCAST(SDValue Op,
 
   // Bitcast double to i64.
   if (Src == MVT::f64 && Dest == MVT::i64) {
+    // Skip lower bitcast when operand0 has converted float results to integer
+    // which was done by function SoftenFloatResult.
+    if (DAG.getTargetLoweringInfo().getTypeAction(
+            *DAG.getContext(), Op.getOperand(0).getValueType()) ==
+        TargetLowering::TypeSoftenFloat)
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yingopq wrote:

> This method is part of MipsSETargetLowering so its part of what DAG.getTargetLoweringInfo() is pointing to (ie. the this pointer) - you can just use:
> 
> ```c++
> if (getTypeAction(*DAG.getContext(), Op.getOperand(0).getValueType()) == TargetLowering::TypeSoftenFloat)
> ```

Oh, I got it and applied it, thanks!

https://github.com/llvm/llvm-project/pull/107543