[llvm] annotate interfaces in llvm/Support for DLL export (#136014)

## Purpose

This patch is one in a series of code-mods that annotate LLVM’s public
interface for export. This patch annotates the `llvm/Support` 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).

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

The following manual adjustments were also applied after running IDS on
Linux:
- Add `#include "llvm/Support/Compiler.h"` to files where it was not
auto-added by IDS due to no pre-existing block of include statements.
- Add `LLVM_ABI` to Windows-only code (auto generated with IDS on
Windows)
- Explicitly make classes non-copyable where needed to due IDS adding
`LLVM_ABI` at the class level
- Add `LLVM_TEMPLATE_ABI` and `LLVM_EXPORT_TEMPLATE` to exported
instantiated templates
- Add `LLVM_ABI_FRIEND` to a small number of `friend` function
declarations
- Add `LLVM_ABI` to a subset of private class methods and fields that
require export
- Add `LLVM_ABI` to a small number of symbols that require export but
are not declared in headers
- Add `LLVM_ABI` functions defined via X-macro

## 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

1 files changed, 13 insertions, 12 deletions

diff --git a/llvm/lib/Support/CommandLine.cpp b/llvm/lib/Support/CommandLine.cpp
index a407be9..49cefb1 100644
--- a/llvm/lib/Support/CommandLine.cpp
+++ b/llvm/lib/Support/CommandLine.cpp
@@ -29,6 +29,7 @@
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Config/config.h"
+#include "llvm/Support/Compiler.h"
 #include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/Error.h"
@@ -54,18 +55,18 @@ using namespace cl;
 //
 namespace llvm {
 namespace cl {
-template class basic_parser<bool>;
-template class basic_parser<boolOrDefault>;
-template class basic_parser<int>;
-template class basic_parser<long>;
-template class basic_parser<long long>;
-template class basic_parser<unsigned>;
-template class basic_parser<unsigned long>;
-template class basic_parser<unsigned long long>;
-template class basic_parser<double>;
-template class basic_parser<float>;
-template class basic_parser<std::string>;
-template class basic_parser<char>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<bool>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<boolOrDefault>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<int>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<long>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<long long>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<unsigned>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<unsigned long>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<unsigned long long>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<double>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<float>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<std::string>;
+template class LLVM_EXPORT_TEMPLATE basic_parser<char>;
 
 template class opt<unsigned>;
 template class opt<int>;