[PATCH] D19528: [ELF] - Implemented -z combrelocs/nocombreloc.

[Rafael Espíndola via llvm-commits]

> One silly question: I need to use LLVM_BUILD_LLVM_DYLIB=true BUILD_SHARED_LIBS=true for that, right ?
> (always used static build, never shared)

I was actually thinking just BUILD_SHARED_LIBS, but both might provide
interesting numbers.

An static but pie build of clang would also be interesting.

Cheers,
Rafael