[zorg] Build.py fix for building Clang Stage 2: cmake, R -g Asan+Ubsan, using Stage 1 RA

[Marc Schifer via llvm-commits]

Chris, 
 Please review.

This patch fixes the Clang Stage 2: cmake, R -g Asan+Ubsan, using Stage 1 RA bot.

Stage 1 was not generating the compile-rt libclang_rt.asan_osx_dynamic.dylib and was not building with correct cmake cache file.  This patch changes two lines in the clang builder function to add
+            '-DCLANG_COMPILER_RT_CMAKE_ARGS={}/llvm/projects/compiler-rt/cmake/caches/Apple.cmake'.format(conf.workspace),
+            '-DCOMPILER_RT_BUILD_SANITIZERS=On',

Tests included in patch.

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