[llvm] [BOLT] Fix debug line emission for functions in multiple compilation units (PR #151230)

[Paschalis Mpeis via llvm-commits]

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+## Test that BOLT correctly handles debug line information for functions
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paschalis-mpeis wrote:

At a quick glance, this test is not tied to X86, right?
Can you make it also run on AArch64?

https://github.com/llvm/llvm-project/pull/151230