Switch from using a lit.cfg-generator variable to the real variable in

the standalone mode. We've changed scoping and sequencing of variables
being defined and that cause this to start to be unset breaking some
cmake users. Thanks to Jordan Rose for the report.

The fix also makes the condition on the preceding line much more
sensible. =D

llvm-svn: 159576

clang/test/CMakeLists.txt

@@ -51,7 +51,7 @@ else()
   include(FindPythonInterp)
   if(PYTHONINTERP_FOUND)
     if( LLVM_MAIN_SRC_DIR )
-      set(LIT "${LLVM_SOURCE_DIR}/utils/lit/lit.py")
+      set(LIT "${LLVM_MAIN_SRC_DIR}/utils/lit/lit.py")
     else()
       set(LIT "${PATH_TO_LLVM_BUILD}/bin/${CMAKE_CFG_INTDIR}/llvm-lit")
       # Installed LLVM does not contain ${CMAKE_CFG_INTDIR} in paths.