This is NFC because these instructions are never selected just
by itself.

This PR is part of an effort to remove file system usage from the
command line parsing code. The reason for that is that it's impossible
to do file system access correctly without a configured VFS, and the VFS
can only be configured after the command line is parsed. I don't want to
intertwine command line parsing and VFS configuration, so I decided to
perform the file system access after the command line is parsed and the
VFS is configured - ideally right before the file system entity is used
for the first time.

This patch delays normalization of the module cache path until
`CompilerInstance` is asked for the cache path in the current
compilation context.

This change improves how LLDB's ProcessElfCore plugin identifies the
main executable when loading ELF core files. Previously, the code would
simply use the first entry in the NT_FILE section, which is not
guaranteed to be the main executable, also the first entry might not
have a valid UUID.

1. **Storing executable name**: Extract the executable name from the ELF
NT_PRPSINFO note and store it in `m_executable_name`

2. **Preferential matching**: When selecting the main executable from
NT_FILE entries, prefer entries whose path ends with the stored
executable name

3. **UUID-based lookup**: Call `FindModuleUUID()` helper function to
properly match modules by path and retrieve a valid UUID

Co-authored-by: George Hu <hyubo@meta.com>

The test exposes existing root profile propagation issues