[llvm] [Mips] Add lowerConstantFP to optimize some floating load instrs to mtc1+mthc1 (PR #196226)

[Jiaxun Yang via llvm-commits]

================
@@ -47,6 +47,10 @@ def SDT_MipsExtractElementF64_FPR : SDTypeProfile<1, 2, [SDTCisVT<0, f32>,
 def SDT_MipsMTC1_D64 : SDTypeProfile<1, 1, [SDTCisVT<0, f64>,
                                             SDTCisVT<1, i32>]>;
 
+def SDT_MipsMTHC1_D64 : SDTypeProfile<1, 2, [SDTCisVT<0, f64>,
----------------
FlyGoat wrote:

I belive this SDT unnecessary any more?

https://github.com/llvm/llvm-project/pull/196226