[llvm] [PowerPC][CodeGen] Exploit STMW and LMW in 32-bit big-endian mode. (PR #74415)

[Kai Luo via llvm-commits]

================
@@ -2399,6 +2405,43 @@ bool PPCFrameLowering::assignCalleeSavedSpillSlots(
   return AllSpilledToReg;
 }
 
+static void findContinuousLoadStore(const MachineFunction *MF,
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bzEq wrote:

```suggestion
static bool findConsecutiveLoadStore(const MachineFunction *MF,
```
Return `true` if consecutive ld/std found.

https://github.com/llvm/llvm-project/pull/74415