[lldb][AIX] Need to add per thread variants of getProcFile in AIX

[DhruvSrivastavaX]

With this PR,
We have moved the Support.cpp common variants under posix, which aix and other platforms can directly use:

• [lldb][AIX] get host info for AIX #134354

But we need AIX variant for thread version of getProcFile.
lldb_private::getProcFile(::pid_t pid, ::pid_t tid, const llvm::Twine &file)

It is different from linux, as follows:

• Linux has /proc/<pid>/task
• AIX has/proc/<pid>/lwp

We can create our aix/Support.cpp and implement the same there.

[DhruvSrivastavaX]

@HemangGadhavi , Please look into this.

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Dhruv Srivastava (DhruvSrivastavaX)

With this PR, We have moved the Support.cpp common variants under posix, which aix and other platforms can directly use:

• [lldb][AIX] get host info for AIX #134354

But we need AIX variant for thread version of getProcFile.
lldb_private::getProcFile(::pid_t pid, ::pid_t tid, const llvm::Twine &file)

It is different than linux as follows:

• Linux has /proc/<pid>/task
• AIX has/proc/<pid>/lwp

We can create our aix/Support.cpp and implement the same there.