[llvm] [ADT] Use "inline static" to initialize CallbacksHolder (NFC) (PR #160003)

[Kazu Hirata via llvm-commits]

kazutakahirata wrote:

> Does this affect the number of relocations?

No, I checked on `lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/Core.cpp.o`.

The text, data, and bss sizes stay the same although the actual executable magically shrinks by a few hundred bytes.


https://github.com/llvm/llvm-project/pull/160003