[llvm] [CMake] Turn on LLVM_USE_SPLIT_DWARF by default for Linux Debug build (PR #80328)

[Alexander Yermolovich via llvm-commits]

ayermolo wrote:

GCC and LLVM have now DWARF5 on by default. It has it's own accelerator tables .debug_names. 
It looks like side affect of this is that we will also be generating --gdb-index in the linker.
I don't think this is the behavior we want with DWARF5.

https://github.com/llvm/llvm-project/pull/80328