[sanitizers] Redirect stdout and stderr to TASK_LOG

[echristo]

Summary

At some point cpplint.py became very noisy during a build spewing a few hundred lines of "Done processing..." even with SILENT=1 in cmake. This attempts to redirect the stdout of "Done processing" to the task log along with any errors.

Tested by this with and without SILENT=1 to check things.

[merge_guards_bot]

Unit tests: pass. 60759 tests passed, 0 failed and 726 were skipped.

clang-format: pass.

Build artifacts: console-log.txt, CMakeCache.txt, test-results.xml, diff.json

[eugenis]

LGTM

compiler-rt/lib/sanitizer_common/scripts/check_lint.sh

 
 EXITSTATUS=0
 ERROR_LOG=$(${MKTEMP})
 
 run_lint() {
   FILTER=$1
   shift
   TASK_LOG=$(${MKTEMP})
-  ${CPPLINT} --filter=${FILTER} "$@" 2>$TASK_LOG
+  ${CPPLINT} --filter=${FILTER} "$@" > $TASK_LOG 2>&1
   if [ "$?" != "0" ]; then
     cat $TASK_LOG | grep -v "Done processing" | grep -v "Total errors found" \
       | grep -v "Skipping input" >> $ERROR_LOG
   fi
   if [ "${SILENT}" != "1" ]; then
     cat $TASK_LOG
   fi
   ${LITLINT} "$@" 2>>$ERROR_LOG