[llvm] annotate interfaces in llvm/TargetParser for DLL export (#143616)

## Purpose

This patch is one in a series of code-mods that annotate LLVM’s public
interface for export. This patch annotates the `llvm/TargetParser`
library. These annotations currently have no meaningful impact on the
LLVM build; however, they are a prerequisite to support an LLVM Windows
DLL (shared library) build.

## Background

This effort is tracked in #109483. Additional context is provided in
[this
discourse](https://discourse.llvm.org/t/psa-annotating-llvm-public-interface/85307),
and documentation for `LLVM_ABI` and related annotations is found in the
LLVM repo
[here](https://github.com/llvm/llvm-project/blob/main/llvm/docs/InterfaceExportAnnotations.rst).

Most of these changes were generated automatically using the [Interface
Definition Scanner (IDS)](https://github.com/compnerd/ids) tool,
followed formatting with `git clang-format`.

Additionally, I manually removed the redundant declaration of
`getCanonicalArchName` from
llvm/include/llvm/TargetParser/ARMTargetParser.h because IDS only
auto-annotates the first declaration it encounters, and the second
un-annotated declaration results in an MSVC warning.

## Validation

Local builds and tests to validate cross-platform compatibility. This
included llvm, clang, and lldb on the following configurations:

- Windows with MSVC
- Windows with Clang
- Linux with GCC
- Linux with Clang
- Darwin with Clang

0 files changed, 0 insertions, 0 deletions