Use proper exit code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183508 91177308-0d34-0410-b5e6-96231b3b80d8
Add a script to help us create source tar balls for the release.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183509 91177308-0d34-0410-b5e6-96231b3b80d8
Fold variable that's only used in assert into the assert.

Avoids unused variable warnings in Release builds.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183512 91177308-0d34-0410-b5e6-96231b3b80d8