Kokoro: build with MLGO

This makes TOT testing closer to production Clang, without adding too
much build time. This also allows dropping in Clang prebuilts from
Kokoro into Android source code for bisection.

Test: N/A
Change-Id: I640c3974d316cf84f3d79f2db5c1907fcb1554f4

kokoro/aosp-master-plus-llvm_build.sh

@@ -18,6 +18,6 @@ repo sync -c
 
 mkdir dist
 DIST_DIR=dist OUT_DIR=out prebuilts/python/linux-x86/bin/python3 \
-  toolchain/llvm_android/test_compiler.py --build-only --no-mlgo \
+  toolchain/llvm_android/test_compiler.py --build-only \
   --target ${AOSP_BUILD_TARGET}-trunk_staging-userdebug \
   --clang-package-path ${KOKORO_GFILE_DIR} .

kokoro/llvm_build.sh

@@ -27,11 +27,13 @@ mkdir -p "${DIST}"
 if [ $LLVM_BUILD_TYPE == "linux-TOT" ]; then
   OUT_DIR="${OUT}" DIST_DIR="${DIST}" $TOP/prebuilts/python/linux-x86/bin/python3 \
   $python_src/build.py --build-llvm-next --create-tar \
+  --mlgo \
   --build-name "${KOKORO_BUILD_NUMBER}" \
   --no-build=windows,lldb
 elif [ $LLVM_BUILD_TYPE == "linux-master" ]; then
   OUT_DIR="${OUT}" DIST_DIR="${DIST}" $TOP/prebuilts/python/linux-x86/bin/python3 \
   $python_src/build.py --create-tar \
+  --mlgo \
   --build-name "${KOKORO_BUILD_NUMBER}" \
   --no-build=windows,lldb
 else