vmtests: add log folding

Sprinkle log folds around, including timing.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>

travis-ci/vmtest/run_vmtest.sh

@@ -1,20 +1,27 @@
 #!/bin/bash
 
-set -eux
+set -eu
+
+source $(cd $(dirname $0) && pwd)/helpers.sh
 
 VMTEST_SETUPCMD="PROJECT_NAME=${PROJECT_NAME} ./${PROJECT_NAME}/travis-ci/vmtest/run_selftests.sh"
 
 echo "KERNEL: $KERNEL"
+echo
 
 # Build latest pahole
 ${VMTEST_ROOT}/build_pahole.sh travis-ci/vmtest/pahole
 
+travis_fold start install_clang "Installing Clang/LLVM"
+
 # Install required packages
 wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
 echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic main" | sudo tee -a /etc/apt/sources.list
 sudo apt-get update
 sudo apt-get -y install clang-12 lld-12 llvm-12
 
+travis_fold end install_clang
+
 # Build selftests (and latest kernel, if necessary)
 KERNEL="${KERNEL}" ${VMTEST_ROOT}/prepare_selftests.sh travis-ci/vmtest/bpf-next