[test-release.sh] Add option to disable building clang-tools-extra during release testing.

[amyk]

Summary

This patch adds an option (no-clang-tools) to disable building clang-tools-extra when
performing release testing. Prior to this patch, clang-tools-extra was built by default,
but on some platforms (such as AIX), clang-tools-extra is not supported, and so we do
not normally build it. Furthermore, this change should not change the invocation for
targets that build clang-tools-extra normally.

[tstellar]

LGTM.

llvm/utils/release/test-release.sh

 RC=""
 Triple=""
 use_gzip="no"
 do_checkout="yes"
 do_debug="no"
 do_asserts="no"
 do_compare="yes"
 do_rt="yes"
+do_clang_tools="yes"
 do_libs="yes"
 do_libcxxabi="yes"
 do_libunwind="yes"
 do_test_suite="yes"
 do_openmp="yes"
 do_lld="yes"
 do_lldb="yes"
 do_polly="yes"
function usage() {
     echo " -test-debug          Test the debug build. [default: no]"
     echo " -test-asserts        Test with asserts on. [default: no]"
     echo " -no-compare-files    Don't test that phase 2 and 3 files are identical."
     echo " -use-gzip            Use gzip instead of xz."
     echo " -use-ninja           Use ninja instead of make/gmake."
     echo " -configure-flags FLAGS  Extra flags to pass to the configure step."
     echo " -git-ref sha         Use the specified git ref for testing instead of a release."
     echo " -no-rt               Disable check-out & build Compiler-RT"
+    echo " -no-clang-tools      Disable check-out & build clang-tools-extra"
     echo " -no-libs             Disable check-out & build libcxx/libcxxabi/libunwind"
     echo " -no-libcxxabi        Disable check-out & build libcxxabi"
     echo " -no-libunwind        Disable check-out & build libunwind"
     echo " -no-test-suite       Disable check-out & build test-suite"
     echo " -no-openmp           Disable check-out & build libomp"
     echo " -no-lld              Disable check-out & build lld"
     echo " -lldb                Enable check-out & build lldb"
     echo " -no-lldb             Disable check-out & build lldb (default)"
case $1 in
             use_gzip="yes"
             ;;
         -no-rt )
             do_rt="no"
             ;;
         -no-libs )
             do_libs="no"
             ;;
+        -no-clang-tools )
+            do_clang_tools="no"
+            ;;
         -no-libcxxabi )
             do_libcxxabi="no"
             ;;
         -no-libunwind )
             do_libunwind="no"
             ;;
         -no-test-suite )
             do_test_suite="no"

 if [ -z "$NumJobs" ]; then
     NumJobs=`grep -c processor /proc/cpuinfo 2> /dev/null || true`
 fi
 if [ -z "$NumJobs" ]; then
     NumJobs=3
 fi
 
 # Projects list
-projects="llvm clang clang-tools-extra"
+projects="llvm clang"
+if [ $do_clang_tools = "yes" ]; then
+  projects="$projects clang-tools-extra"
+fi
 runtimes=""
 if [ $do_rt = "yes" ]; then
   runtimes="$runtimes compiler-rt"
 fi
 if [ $do_libs = "yes" ]; then
   runtimes="$runtimes libcxx"
   if [ $do_libcxxabi = "yes" ]; then
     runtimes="$runtimes libcxxabi"