[Clang][LoongArch] Pass the -mabi and -target-abi options to as and cc1as respectively

This change is necessary to set correct EFlags according to the
options (-m*-float and -mabi=) passed to clang when input is assembly.

Note: `-mabi=` is not documented by `as`.
```
$ as --version
GNU assembler (GNU Binutils) 2.40.50.20230316
...
$ as --target-help
LARCH options:
```

But we can see gcc invokes `as` and passes the `-mabi=` option when compiling C or assembly.
```
$ gcc -c a.c -v 2>&1 -msoft-float | grep "as -v"
 as -v -mabi=lp64s -o a.o /tmp/ccFrxzZi.s
$ gcc -c a.s -v 2>&1 -msoft-float | grep "as -v"
 as -v -mabi=lp64s -o a.o a.s
```

Reviewed By: xen0n

Differential Revision: https://reviews.llvm.org/D150537