[llvm] [RISCV] Add TunePreferAscendingLoadStore for SpacemiT X60 LD/ST fusion (PR #186967)

[Sam Elliott via llvm-commits]

================
@@ -975,7 +975,7 @@ void RISCVFrameLowering::emitPrologue(MachineFunction &MF,
   // FIXME: assumes exactly one instruction is used to restore each
   // callee-saved register.
   MBBI = std::prev(MBBI, getRVVCalleeSavedInfo(MF, CSI).size() +
-                             getUnmanagedCSI(MF, CSI, ReverseCSRSpill).size());
+                             getUnmanagedCSI(MF, CSI, PreferAscendingLS).size());
----------------
lenary wrote:

This (and some places below) are just using this for the size, rather than the contents. Maybe we should be doing something to avoid these repeated calls? I don't know. 

The changes aren't wrong, it's just something I noticed.

https://github.com/llvm/llvm-project/pull/186967