If `--enable-var-scope` is in effect, variables with names that
start with `$` are considered to be global. All other variables are
local. All local variables get undefined at the beginning of each
CHECK-LABEL block. Global variables are not affected by CHECK-LABEL.
This makes it easier to ensure that individual tests are not affected
by variables set in preceding tests.
Differential Revision: https://reviews.llvm.org/D30749
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297396 91177308-0d34-0410-b5e6-96231b3b80d8
