[PATCH] D155925: [JITLink][PowerPC][WIP] Change method to check if a symbol is external to current object

[Kai Luo via Phabricator via llvm-commits]

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When multiple relocatable object files are handled by jitlink, symbols in object files handled firstly are no longer `Symbol.isExternal()` or `!Symbol.isDefined()` for object files handled later. This largely affects TOC transition on PowerPC. TOC pointer is supposed to be same in one object file(if no mulitple TOC appears) and get updated when control flow transferred to another object file.

This patch fixes case when `jitlink -orc-runtime=/path/to/libort_rt.a` is used.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155925

Files:
  llvm/include/llvm/ExecutionEngine/JITLink/ppc64.h
  llvm/lib/ExecutionEngine/JITLink/ELF_ppc64.cpp
  llvm/lib/ExecutionEngine/JITLink/ppc64.cpp

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