[CMake] Quote CCACHE_PROGRAM in case it has spaces

Author: mrkajetanp

llvm/CMakeLists.txt

@@ -290,7 +290,7 @@ if(LLVM_CCACHE_BUILD)
       if (LLVM_CCACHE_DIR)
         set(launcher_params CCACHE_DIR=${LLVM_CCACHE_DIR} ${launcher_params})
       endif()
-      set(launcher ${launcher_params} ${CCACHE_PROGRAM})
+      set(launcher ${launcher_params} "${CCACHE_PROGRAM}")
     else()
       set(LLVM_CCACHE_PARAMS run_second_cpp=true hash_dir=true)
 
@@ -301,7 +301,7 @@ if(LLVM_CCACHE_BUILD)
       if (LLVM_CCACHE_DIR)
         set(launcher_params cache_dir=${LLVM_CCACHE_DIR} ${launcher_params})
       endif()
-      set(launcher ${CCACHE_PROGRAM} ${launcher_params})
+      set(launcher "${CCACHE_PROGRAM}" ${launcher_params})
     endif()
 
     set(CMAKE_C_COMPILER_LAUNCHER ${launcher})