[llvm] [LTO] Handle GlobalIFunc in LTOModule::parseSymbols (PR #212515)

[Wael Yehia via llvm-commits]

w2yehia wrote:

XCOFF (which is AIX only) does not support IFUNC natively, instead we simulate it via a compiler+runtime implementation. 

https://github.com/llvm/llvm-project/pull/212515