[lld] Convert LLVM_CMAKE_PATH to a CMake path
Otherwise I get the following error on windows.
```
CMake Error at D:/bld/lld_1569206597988/work/build/CMakeFiles/CMakeTmp/CMakeLists.txt:2 (set):
Syntax error in cmake code at
D:/bld/lld_1569206597988/work/build/CMakeFiles/CMakeTmp/CMakeLists.txt:2
when parsing string
D:\bld\lld_1569206597988\_h_env\Library\lib\cmake\llvm
Invalid character escape '\b'.
CMake Error at D:/bld/lld_1569206597988/_build_env/Library/share/cmake-3.15/Modules/CheckSymbolExists.cmake:100 (try_compile):
Failed to configure test project build system.
Call Stack (most recent call first):
D:/bld/lld_1569206597988/_build_env/Library/share/cmake-3.15/Modules/CheckSymbolExists.cmake:57 (__CHECK_SYMBOL_EXISTS_IMPL)
D:/bld/lld_1569206597988/_h_env/Library/lib/cmake/llvm/HandleLLVMOptions.cmake:943 (check_symbol_exists)
CMakeLists.txt:56 (include)
```
Reviewed By: sbc100
Differential Revision: https://reviews.llvm.org/D68158