[clang] [llvm] Add support for Windows Secure Hot-Patching (PR #138972)

[via cfe-commits]

sivadeilra wrote:

@aganea , I've encountered one problem with this PR.  The pass which creates the `__ref_*` variables needs to run before `CodeViewDebug::collectGlobalVariableInfo`, but the way we did this in this PR breaks several other integration tests.  From looking at the sequence of passes, `CodeViewDebug::collectGlobalVariableInfo` runs under `AsmPrinter::doInitialization`.

What's the best place to do this `__ref_*` rewrite pass?

https://github.com/llvm/llvm-project/pull/138972