[PATCH] D142846: [JITLink] Adds support for PLT based relocations to the ELF/i386 JITLink backend

[Kshitij Jain via Phabricator via llvm-commits]

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This commit adds support for PLT based relocations. Specifically -

1. It adds logic to create a `PLTTableManager` in the `buildTables_ELF_i386`

function, which is called as part of the post-prune JITLink passes. The `PLTTableManager`
handles creating pointer jump stubs and related GOT entries for position independent
code.

2. It also adds a pre-fixup pass to optimize away PLT based calls in position independent

code, when possible.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142846

Files:
  llvm/include/llvm/ExecutionEngine/JITLink/i386.h
  llvm/lib/ExecutionEngine/JITLink/ELF_i386.cpp
  llvm/lib/ExecutionEngine/JITLink/i386.cpp
  llvm/test/ExecutionEngine/JITLink/i386/ELF_i386_small_pic_relocations.s
  llvm/test/ExecutionEngine/JITLink/i386/ELF_i386_small_pic_relocations_got.s
  llvm/test/ExecutionEngine/JITLink/i386/ELF_i386_small_pic_relocations_plt.s

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