[PATCH] [lld] Revive standalone CMake build

[Greg Fitzgerald]

REPOSITORY
  rL LLVM

================
Comment at: cmake/config-ix.cmake:6
@@ +5,2 @@
+int main() { return 0; }
+" HAVE_CXXABI_H)
----------------
shankarke wrote:
> why is this being reimplemented ?
Because the LLVM install directory does not offer this functionality.

http://reviews.llvm.org/D7625

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