Add a build flag for the undefined behavior sanitizer, aka "ubsan".

Ubsan checks for undefined behavior according to the C++
standard. Some of this behavior has been known to be exploited by
optimizing compilers to produce bizarre results, like taking both
branches of a conditional.

This patch only adds build options; fixing the errors ubsan finds, as
well as adding any tests that a build is free from ubsan errors, are
not covered in this patch.

Change-Id: I03044c657ac171daa0648f833bbbeed7bdde49cb
Reviewed-on: http://gerrit.cloudera.org:8080/6186
Reviewed-by: Dan Hecht <dhecht@cloudera.com>
Tested-by: Impala Public Jenkins

buildall.sh

@@ -59,6 +59,7 @@ CODE_COVERAGE=0
 BUILD_ASAN=0
 BUILD_FE_ONLY=0
 BUILD_TIDY=0
+BUILD_UBSAN=0
 # Export MAKE_CMD so it is visible in scripts that invoke make, e.g. copy-udfs-udas.sh
 export MAKE_CMD=make
 LZO_CMAKE_ARGS=
@@ -114,6 +115,9 @@ do
     -tidy)
       BUILD_TIDY=1
       ;;
+    -ubsan)
+      BUILD_UBSAN=1
+      ;;
     -testpairwise)
       EXPLORATION_STRATEGY=pairwise
       ;;
@@ -182,6 +186,7 @@ do
       echo "[-codecoverage] : Build with code coverage [Default: False]"
       echo "[-asan] : Address sanitizer build [Default: False]"
       echo "[-tidy] : clang-tidy build [Default: False]"
+      echo "[-ubsan] : Undefined behavior build [Default: False]"
       echo "[-skiptests] : Skips execution of all tests"
       echo "[-notests] : Skips building and execution of all tests"
       echo "[-start_minicluster] : Start test cluster including Impala and all"\
@@ -260,6 +265,9 @@ fi
 if [[ ${BUILD_TIDY} -eq 1 ]]; then
   CMAKE_BUILD_TYPE=TIDY
 fi
+if [[ ${BUILD_UBSAN} -eq 1 ]]; then
+  CMAKE_BUILD_TYPE=UBSAN
+fi
 
 MAKE_IMPALA_ARGS+=" -build_type=${CMAKE_BUILD_TYPE}"