PR10867: Work around a bug in lit. Multiple RUN: lines are joined with &&, so:

PR10867: Work around a bug in lit. Multiple RUN: lines are joined with &&, so:

  RUN: foo
  RUN: bar || true

is equivalent to:

  RUN: foo && bar || true

which is equivalent to:

  RUN: (foo && bar) || true

This resulted in several of the fixit tests not really testing anything.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139132 91177308-0d34-0410-b5e6-96231b3b80d8