Fix 2 stage build on some apple bots.

The recent lit refactor changed the location of the lit script
run by check targets from <source>/utils/lit/lit.py to
<bin>/llvm-lit.py.  In some 2-stage build scenarios, the location
of <bin> was not properly passed through to the second stage,
and it was looking for /llvm-lit.py instead, causing failures.

Fix suggested by Mike Edwards and Chris Bieneman @apple

llvm-svn: 313300

Author: Zachary Turner

clang/runtime/CMakeLists.txt

@@ -77,6 +77,7 @@ if(LLVM_BUILD_EXTERNAL_COMPILER_RT AND EXISTS ${COMPILER_RT_SRC_ROOT}/)
                -DCOMPILER_RT_INCLUDE_TESTS=${LLVM_INCLUDE_TESTS}
                -DCMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}
                -DLLVM_LIBDIR_SUFFIX=${LLVM_LIBDIR_SUFFIX}
+               -DLLVM_RUNTIME_OUTPUT_INTDIR=${LLVM_RUNTIME_OUTPUT_INTDIR}
                -DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}
                -DCMAKE_OSX_SYSROOT:PATH=${CMAKE_OSX_SYSROOT}
                ${COMPILER_RT_PASSTHROUGH_VARIABLES}