[PATCH] Do not destroy external linkage when deleting function body

[Petar Jovanovic]

Hi dexonsmith, rafael,

The function deleteBody() converts the linkage to external and thus destroys
original linkage type value. Lack of correct linkage type causes wrong
relocations to be emitted later.
Calling dropAllReferences() instead of deleteBody() will fix the issue.

http://reviews.llvm.org/D5415

Files:
  lib/Bitcode/Reader/BitcodeReader.cpp
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