[llvm] annotate interfaces in llvm/ExecutionEngine for DLL export (#140809)

## Purpose

This patch is one in a series of code-mods that annotate LLVM’s public
interface for export. This patch annotates the `llvm/ExecutionEngine`
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 `LLVM_ABI_FRIEND` to friend member functions declared with
`LLVM_ABI`
- 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` to a number of `extern "C"` methods that IDS missed
because they're implicitly exported

## 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, 4 insertions, 5 deletions

diff --git a/llvm/lib/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.cpp b/llvm/lib/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.cpp
index fd62632..cb1b3b0 100644
--- a/llvm/lib/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/TargetProcess/JITLoaderGDB.cpp
@@ -24,14 +24,13 @@ extern "C" {
 // We put information about the JITed function in this global, which the
 // debugger reads.  Make sure to specify the version statically, because the
 // debugger checks the version before we can set it during runtime.
-LLVM_ALWAYS_EXPORT
-struct jit_descriptor __jit_debug_descriptor = {JitDescriptorVersion, 0,
-                                                nullptr, nullptr};
+LLVM_ABI LLVM_ALWAYS_EXPORT struct jit_descriptor __jit_debug_descriptor = {
+    JitDescriptorVersion, 0, nullptr, nullptr};
 
 // Debuggers that implement the GDB JIT interface put a special breakpoint in
 // this function.
-LLVM_ALWAYS_EXPORT
-LLVM_ATTRIBUTE_NOINLINE void __jit_debug_register_code() {
+LLVM_ABI LLVM_ALWAYS_EXPORT LLVM_ATTRIBUTE_NOINLINE void
+__jit_debug_register_code() {
   // The noinline and the asm prevent calls to this function from being
   // optimized out.
 #if !defined(_MSC_VER)