[llvm] [llvm][arm] add T1 and T2 assembly options for vlldm and vlstm (PR #83116)

[via llvm-commits]

sivan-shani wrote:

Windows pipeline is failing on mysterious file that does not seems to be related to the change:
```
># error: command failed with exit status: 0xc0000005
# executed command: 'c:\ws\src\build\bin\filecheck.exe' 'C:\ws\src\flang\test\Fir\memory-allocation-opt.fir'
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  c:\ws\src\build\bin\filecheck.exe C:\ws\src\flang\test\Fir\memory-allocation-opt.fir
# `-----------------------------
# error: command failed with exit status: 2
```


https://github.com/llvm/llvm-project/pull/83116