[clang] [llvm] Add support for Windows hot-patching (PR #138972)

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+// This verifies that hotpatch function attributes are correctly propagated through LLVM IR when compiling with LTO.
+//
+// RUN: %clang_cl -c --target=x86_64-windows-msvc -O2 /Z7 -fms-hotpatch-functions-file=%S/ms-hotpatch-functions.txt -flto /Fo%t.bc %s
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sivadeilra wrote:

Good to know.  I've changed this to a single `echo`, which I think is simpler than using `split-file`.  If it gets any more complicated than that, I'll use `split-file`.

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