Since #189401, LLVM and Clang generate `S_DEFRANGE_REGISTER_REL_INDIR`
for indirect locations. This adds support in LLDB.
The offset added after dereferencing is signed here - unlike in
`S_REGREL32_INDIR` (at least that's the assumption). So I updated
`MakeRegisterBasedIndirectLocationExpressionInternal` to handle the
signedness. This is the reason the MSVC test was changed here.
I didn't find a test case where LLVM emits the record with the `VFRAME`
register. Other than that, the clang test is similar to the MSVC one
except that the locations are slightly different.
In #183172, I added support for reading `S_REGREL32_INDIR` records. This
adds support in LLDB. The record is emitted by MSVC for structured
bindings and in the compiler generated coroutine stubs.
It describes a location at `*(Register + Offset) + OffsetInUdt`.
Equivalent to
```
DW_OP_breg{reg} {Offset}
DW_OP_deref
DW_OP_plus_uconst {OffsetInUdt}
```
LLVM doesn't create this record - it only creates `S_LOCAL`s for local
variables. We'll probably need `S_DEFRANGE_REGISTER_REL_INDIR` for this
- should be simple to figure out the structure, but I haven't seen that
record emitted yet.
