Clang is adding support for the new `OpenMP transparent` clause on
`task` and `taskloop` directives.
The parsing and semantic handling for this clause is introduced in
https://github.com/llvm/llvm-project/pull/166810 .
To allow the compiler to communicate this clause to the `OpenMP`
runtime, a dedicated bit in `kmp_tasking_flags` is required.
This patch adds a new compiler-reserved bit `transparent` to the`
kmp_tasking_flags` structure.

Commit bb563b1 handles the links in the build directory but 
misses the case in the install step. This patch is to link only 
the libomp.a on AIX.

Reverts llvm/llvm-project#164392 due to fortran issues

Use the implementation in libomptarget. If libomptarget is not
available, always return the UID / device number of the host / the
initial device.

On AIX, it generates libomp for both static and dynamic. There is no
need to create symbolic links to libomp.so.

---------

Co-authored-by: Xing Xue <xingxue@outlook.com>

When OMPT is enabled, the stack pointer was not saved to frame pointer
register immediately after storing the frame pointer to the stack.
Therefore the frame pointers did not constitute a proper chain.
Fixes [#163352](https://github.com/llvm/llvm-project/issues/163352)

Implementation files using the Intel syntax explicitly specify it.
Do the same for the few files using AT&T syntax.

This also enables building LLVM with `-mllvm -x86-asm-syntax=intel` in one's Clang config files
(i.e. a global preference for Intel syntax).

No functional change intended.

Fix https://github.com/llvm/llvm-project/issues/156679

There is a mismatch between the preprocessor guards around the include
of `hwloc.h` and those protecting its usages, leading to build failures
on Darwin: https://github.com/spack/spack-packages/pull/1212

This change introduces `KMP_HWLOC_ENABLED` that reflects
whether hwloc is actually used.