[PATCH] Fix missing -fno-rtti on `llvm-config --cxxflags` with CMake.

[jfonseca at vmware.com]

Unforunately CMAKE_CXX_FLAGS is updated as a side effect of
add_llvm_tool() and llvm_process_sources() macros, therefore
add_llvm_tool() must be at the top so that -fno-rtti appears on
tools/llvm-config/BuildVariables.inc

Nevertheless this is brittle.  A better fix would be to modify
CMAKE_CXX_FLAGS globally, on the top CMakeLists.txt, instead of a hidden
side-effect.
---
 tools/llvm-config/CMakeLists.txt | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

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