[LoongArch64] Fix the segment fault within JIT_UpdateWriteBarrierState.

[shushanhf]

Hi, @janvorli
After #69672 merged, the LA had to follow it for segment fault.

(1) there is an segment fault for LA within JIT_UpdateWriteBarrierState;

Thread 1 "corerun" received signal SIGSEGV, Segmentation fault.
JIT_UpdateWriteBarrierState () at /home/qiao/work_qiao/push_runtime/src/coreclr/vm/loongarch64/asmhelpers.S:97
97	    st.d  $a0, $t2, 0

First, I had fixed this error by the first patch.

(2) another segment fault when writing the first instruction: （This error had been fixed by #69975 ）

Thread 1 "corerun" received signal SIGSEGV, Segmentation fault.
0x000000ff7c7eb330 in emitter::emitOutputInstr (this=0xaaaabd1968, ig=0xaaaabe7240, id=0xaaaabebfc4, dp=0xfffffef050)
    at /home/qiao/work_qiao/push_runtime/src/coreclr/jit/emitloongarch64.cpp:3768
3768	            *(code_t*)dst = id->idAddr()->iiaGetInstrEncode();

This error is caused by the #69672 .
If export COMPlus_EnableWriteXorExecute=0 it will be ok.

This error had been fixed by #69975

[shushanhf]

This is part of the issue #69705 to amend the LA's port.

[shushanhf]

Hi, @janvorli
Could you please review this PR and give me some advices ?

This error is caused by the #69672 .
If export COMPlus_EnableWriteXorExecute=0 it will be ok.

[shushanhf]

Hi, @janvorli Could you please review this PR and give me some advices ?

This error is caused by the #69672 . If export COMPlus_EnableWriteXorExecute=0 it will be ok.

This error had been fixed by #69975

[shushanhf]

Hi, @jkotas @mangod9 @janvorli
Could you please review this PR ?
Thanks

[jkotas]

Thanks