Remove lit's --summary flag from buildbots.

[EricWF]

Summary

The summary flag causes a progress bar to appear and be rewritten using
a curses like interface. This works great for interactive sessions, but
produces line after line of garbage in the logs.

This should cause the logs to be much smaller and more readable.

[Mordante]

I like the idea. I want to have a look once the build https://buildkite.com/llvm-project/phabricator-libcxx-ci/builds/29307 finishes.

[ldionne]

I like this, it makes the logs more readable. The CI failures are flukes on our Windows bots that had a transient issue. Let's ship this!

libcxx/appveyor.yml

build_script:
   - echo %configuration%
 
   #############################################################################
   # Configuration Step
   #############################################################################
   - cmake -G "%GENERATOR%" %CMAKE_OPTIONS%
     "-DCMAKE_BUILD_TYPE=%configuration%"
     "-DLLVM_PATH=C:\projects\deps\llvm"
-    -DLLVM_LIT_ARGS="-sv --show-xfail --show-unsupported"
+    -DLLVM_LIT_ARGS="-v --show-xfail --show-unsupported"
     %APPVEYOR_BUILD_FOLDER%
 
   #############################################################################
   # Build Step
   #############################################################################
   - "%MAKE_PROGRAM%"
 
 test_script:

libcxx/utils/ci/run-buildbot

${CMAKE} \
           -GNinja -DCMAKE_MAKE_PROGRAM="${NINJA}" \
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DCMAKE_INSTALL_PREFIX="${INSTALL_DIR}" \
           -DLIBCXX_ENABLE_WERROR=YES \
           -DLIBCXXABI_ENABLE_WERROR=YES \
           -DLIBUNWIND_ENABLE_WERROR=YES \
           -DLIBCXX_ENABLE_CLANG_TIDY=${ENABLE_CLANG_TIDY} \
           ${ENABLE_STD_MODULES} \
-          -DLLVM_LIT_ARGS="-sv --show-unsupported --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
+          -DLLVM_LIT_ARGS="-v --show-unsupported --xunit-xml-output test-results.xml --timeout=1500 --time-tests" \
           "${@}"
 }
 
 function generate-cmake() {
     generate-cmake-base \
           -DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi;libunwind" \
           -DLIBCXX_CXX_ABI=libcxxabi \
           "${@}"