[llvm] [SystemZ] Enable MachineCombiner for FP reassociation (PR #83546)

[Jonas Paulsson via llvm-commits]

JonPsson1 wrote:

Updated tests: anyregcc.ll and stackmap.ll.

> Also, if we use the approach below to have optimizeLoadInstr call foldMemoryOperand, then we already get the CC handling in foldMemoryOperandImpl, so wouldn't have to duplicate the implementation.

I think we need two different implementations: One quick if LiveIntervals is available ("FI version"), and one that does the scan ("MI version"). Even though there is the LIS argument to the "MI version", it is optional and null as this is still on SSA form.


https://github.com/llvm/llvm-project/pull/83546