LoongArch: Enable exception fixup for specific ADE subcode

In the Linux kernel, the following vulnerability has been resolved:

LoongArch: Enable exception fixup for specific ADE subcode

This patch allows the LoongArch BPF JIT to handle recoverable memory

access errors generated by BPF_PROBE_MEM* instructions.

When a BPF program performs memory access operations, the instructions

it executes may trigger ADEM exceptions. The kernel’s built-in BPF

exception table mechanism (EX_TYPE_BPF) will generate corresponding

exception fixup entries in the JIT compilation phase; however, the

architecture-specific trap handling function needs to proactively call

the common fixup routine to achieve exception recovery.

do_ade(): fix EX_TYPE_BPF memory access exceptions for BPF programs,

ensure safe execution.

Relevant test cases: illegal address access tests in module_attach and

subprogs_extable of selftests/bpf.