[PATCH] D23841: Fix ThinLTO crash with debug info

[Mehdi AMINI via llvm-commits]

mehdi_amini created this revision.
mehdi_amini added a reviewer: tejohnson.
mehdi_amini added a subscriber: llvm-commits.
Herald added a subscriber: mehdi_amini.

Because the recent change about ODR type uniquing in the context,
we can reach types defined in another module during IR linking.
This triggered some assertions in case we IR link without starting
from an empty module. To alleviate that, we can self-map metadata
defined in the destination module so that they won't be visited.

https://reviews.llvm.org/D23841

Files:
  include/llvm/IR/TypeFinder.h
  lib/Linker/IRMover.cpp
  test/ThinLTO/X86/Inputs/crash_debuginfo.ll
  test/ThinLTO/X86/crash_debuginfo.ll

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