[PATCH] Adding llvm-shlib to CMake build system with a few new bells and whistles

[NAKAMURA Takumi]

IMO, I wonder the term "DYLIB" here might be odd. I mis-imagined this were darwin-specific stuff at first.

That said, I don't have better idea for now.
- Configure provides --enable-shared
- CMakefiles provides BUILD_SHARED_LIBS.
- FYI, in past, I tried to introduce LLVM_ENABLE_SHARED. (See D2942).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5890