[sanitizers] Don't enable asserts on stage1 clang

[vitalybuka]

Remove files

[alekseyshl]

What's wrong with assertions now?

[vitalybuka]

In D34492#788309, @alekseyshl wrote:

What's wrong with assertions now?

This is for pinned revison which is usually 2-3 month old and suppose to be good.
We used this build only to quickly bootstrap clang, other bots like linux or bootstrap build the same anyway on ToT with asserts enabled.
I expect this is going to be a little bit faster.

zorg/trunk/zorg/buildbot/builders/sanitizers/buildbot_fast.sh

 STAGE2_ASAN_DIR=llvm_build_asan
 STAGE2_MSAN_DIR=llvm_build_msan
 STAGE2_UBSAN_DIR=llvm_build_ubsan
 STAGE2_LIBCXX_MSAN_DIR=libcxx_build_msan
 STAGE2_LIBCXX_ASAN_DIR=libcxx_build_asan
 STAGE2_LIBCXX_UBSAN_DIR=libcxx_build_ubsan
 STAGE1_CLOBBER="${STAGE2_LIBCXX_MSAN_DIR} ${STAGE2_LIBCXX_ASAN_DIR} ${STAGE2_LIBCXX_UBSAN_DIR} ${STAGE2_MSAN_DIR} ${STAGE2_ASAN_DIR} ${STAGE2_UBSAN_DIR}"
 LLVM=$ROOT/llvm
-CMAKE_COMMON_OPTIONS="-GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_PARALLEL_LINK_JOBS=20"
+CMAKE_COMMON_OPTIONS="-GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_PARALLEL_LINK_JOBS=20"
 
 if [ "$BUILDBOT_CLOBBER" != "" ]; then
   echo @@@BUILD_STEP clobber@@@
   rm -rf llvm
   rm -rf ${STAGE1_DIR}
 fi
 
 # Stage 1
 
 build_stage1_clang_at_revison 305968
 
+CMAKE_COMMON_OPTIONS="$CMAKE_COMMON_OPTIONS -DLLVM_ENABLE_ASSERTIONS=ON"
+
 echo @@@BUILD_STEP update@@@
 buildbot_update
 
 # Stage 2 / Memory Sanitizer
 
 build_stage2_msan
 
 check_stage2_msan