[llvm] [CFIInstrInserter] A test showing the need to handle `cfi_escape`. (PR #128211)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

The fix I propose for this is:
https://github.com/llvm/llvm-project/pull/125104

Eventually, this is needed for https://github.com/llvm/llvm-project/pull/90819

https://github.com/llvm/llvm-project/pull/128211