Also delete unused _CLC_DEFINE_BINARY_BUILTIN_WITH_SCALAR_SECOND_ARG, _CLC_DEFINE_UNARY_BUILTIN_FP16 and _CLC_DEFINE_BINARY_BUILTIN_FP16. llvm-diff shows no change to nvptx64--nvidiacl.bc and amdgcn--amdhsa.bc
Also delete unused _CLC_DEFINE_BINARY_BUILTIN_WITH_SCALAR_SECOND_ARG, _CLC_DEFINE_UNARY_BUILTIN_FP16 and _CLC_DEFINE_BINARY_BUILTIN_FP16. llvm-diff shows no change to nvptx64--nvidiacl.bc and amdgcn--amdhsa.bc