[llvm] [Mips] Fix compiler crash when returning fp128 after calling a functi… (PR #117525)

[via llvm-commits]

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@@ -4781,7 +4781,7 @@ class TargetLowering : public TargetLoweringBase {
   virtual bool CanLowerReturn(CallingConv::ID /*CallConv*/,
                               MachineFunction &/*MF*/, bool /*isVarArg*/,
                const SmallVectorImpl<ISD::OutputArg> &/*Outs*/,
-               LLVMContext &/*Context*/) const
+               LLVMContext &/*Context*/, const Type *RetTy) const
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yingopq wrote:

Because in Mips backend, when process hook function CanLowerReturn, they now use MF function return type to check whether call function return type was origin from fp128. 
In fact, when they check whether MF function return type was origin from fp128, they should use MF function return type; when they check whether call function return type was origin from fp128, they should use call function return type.
So, we need a new parameter to specify the right return type.

https://github.com/llvm/llvm-project/pull/117525