[PowerPC] Don't lower CALL to CALL_NOP on LV2 (PS3)

[ProtoByter]

Summary

This change stops LLVM from lowering PPCISD::CALL to PPCISD::CALL_NOP on LV2 since it stops it from being able to build LV2 code
I've tested this with RPCS3 using a sample from PSL1GHT and I can confirm that it runs for me
This fixes issue #55456

[ProtoByter]

Turns out that this fix will only work when there aren't multiple TOCs so it's not very useful, I have a feeling that the issue lies deeper in the backend, like in the tablegen files, however I'm not very experienced so I don't completely know what I'm doing :(

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

     // TOC pointer at an ABI designated offset in the linkage area and the
     // linker will rewrite the nop to be a load of the TOC pointer from the
     // linkage area into gpr2.
-    RetOpc = callsShareTOCBase(&Caller, Callee, TM) ? PPCISD::CALL
-                                                    : PPCISD::CALL_NOP;
+    RetOpc = callsShareTOCBase(&Caller, Callee, TM)
+        && Subtarget.getTargetTriple().getOS() != Triple::Lv2   ? PPCISD::CALL
+                                                                : PPCISD::CALL_NOP;
   else
     RetOpc = PPCISD::CALL;
   if (IsStrictFPCall) {