[LoongArch] Fix assertion failure for annotate tablejump (#140907)

Fix a use-after-free issue related to annotateTableJump in the LoongArch
target.

Previously, `LoongArchPreRAExpandPseudo::annotateTableJump()` recorded a
reference to a MachineOperand representing a jump table index. However,
later optimizations such as the `BranchFolder` pass may delete the
instruction containing this operand, leaving a dangling reference.

This led to an assertion failure in
`LoongArchAsmPrinter::emitJumpTableInfo()` when trying to access a freed
MachineOperand via `getIndex()`.

The fix avoids holding a reference to the MachineOperand. Instead, we
extract and store the jump table index at the time of annotation. During
`emitJumpTableInfo()`, we verify whether the recorded index still exists
in the MachineFunction's jump table. If not, we skip emission for that
entry.

Fixes #140904

0 files changed, 0 insertions, 0 deletions