I also noticed this problem with latest SVN build (r162623) on Ubuntu
12.04. LLVMgold.so was not linked to libLTO.so, which caused problems
when using it:

    /usr/bin/ld: error: /opt/clang/bin/../lib/LLVMgold.so: could not
load plugin library: /opt/clang/bin/../lib/LLVMgold.so: undefined
symbol: lto_codegen_add_must_preserve_symbol

Using the above patch solved the problem.

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https://bugs.launchpad.net/bugs/1026359

Title:
  clang -O4 -use-gold-plugin fails (LLVMgold.so: undefined symbol:
  lto_codegen_compile_to_file)

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