[PATCH] D151801: [JITLink] Add missing vtable anchors

[Stefan Gränitz via Phabricator via llvm-commits]

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This patch fixes the following missing symbols when linking JITLink in a shared library:

  $ llvm-objdump -t libMyShared.so | grep _ZTVN4llvm7jitlink
  0000000000000000         *UND*  0000000000000000 _ZTVN4llvm7jitlink25InProcessEHFrameRegistrarE
  0000000000000000         *UND*  0000000000000000 _ZTVN4llvm7jitlink16EHFrameRegistrarE
  0000000000000000         *UND*  0000000000000000 _ZTVN4llvm7jitlink14JITLinkContextE
  0000000000000000         *UND*  0000000000000000 _ZTVN4llvm7jitlink22InProcessMemoryManagerE
  0000000000000000         *UND*  0000000000000000 _ZTVN4llvm7jitlink20JITLinkMemoryManagerE

These symbols exist in the static lib, e.g.:

  $ llvm-objdump -t lib/libLLVMJITLink.a | grep _ZTVN4llvm7jitlink25InProcessEHFrameRegistrarE
  0000000000000038 g     O .data.rel.ro   0000000000000038 _ZTVN4llvm7jitlink25InProcessEHFrameRegistrarE


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D151801

Files:
  llvm/include/llvm/ExecutionEngine/JITLink/EHFrameSupport.h
  llvm/include/llvm/ExecutionEngine/JITLink/JITLink.h
  llvm/include/llvm/ExecutionEngine/JITLink/JITLinkMemoryManager.h
  llvm/lib/ExecutionEngine/JITLink/EHFrameSupport.cpp
  llvm/lib/ExecutionEngine/JITLink/JITLink.cpp
  llvm/lib/ExecutionEngine/JITLink/JITLinkMemoryManager.cpp

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