[llvm] [Mips] Add the missing judgment when processing function handleMFLOSlot (PR #121463)

[via llvm-commits]

================
@@ -0,0 +1,67 @@
+; RUN: llc -filetype=asm < %s -mcpu=mips2 | FileCheck %s -check-prefixes=MIPS2
+;
----------------
yingopq wrote:

OK, applied.

https://github.com/llvm/llvm-project/pull/121463