[llvm] MIPS: Adding a check for JAL argument in PIC mode to prevent crashing on getExpr (PR #120356)

[YunQiang Su via llvm-commits]

================
@@ -2108,6 +2108,10 @@ bool MipsAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
   if ((Opcode == Mips::JAL || Opcode == Mips::JAL_MM) && inPicMode()) {
     warnIfNoMacro(IDLoc);
 
+    if (!Inst.getOperand(0).isExpr()) {
+      return Error(IDLoc, "jal needs a symbolic expression in PIC mode");
----------------
wzssyqa wrote:

gas gives the error message like:
```
k.s: Assembler messages:
k.s:2: Error: unsupported constant in relocation
```
I think that we should keep them same.

https://github.com/llvm/llvm-project/pull/120356