[cmake] Refactor out llvm related config from swift_common_standalone_build_config to swift_common_standalone_build_config_llvm.
[cmake] Refactor out llvm related config from swift_common_standalone_build_config to swift_common_standalone_build_config_llvm.

*NOTE* The diff looks bigger than it actually is. This is just a pure
refactoring.

rdar://26154980

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