[llvm] Modify llvm-gsymutil lookups to handle overlapping ranges correctly. (PR #72350)

[Greg Clayton via llvm-commits]

clayborg wrote:

> > we had debug info for a function with a range like [0x100-0x200) and a symbol at the same start address yet with a larger range like [0x100-0x300)
> 
> Do you have a test case for where this happens? If clang/llvm are producing debug info like that I'd be concerned/want to look into fixing it.

This is Haskell debugging related where the compiler is producing debug info with a small sized `DW_TAG_subprogram` and the symbol table symbol has a much larger range. I don't believe clang supports Haskell. The `DW_AT_producer` in this case is:
```
DW_AT_producer    ("The Glorious Glasgow Haskell Compilation System 8.8.3")
```

https://github.com/llvm/llvm-project/pull/72350