[OpenMP] Update CHECK-DAG usage in for_codegen.cpp
This patch adjusts a test not to depend on deprecated FileCheck
behavior that permits overlapping matches within a block of CHECK-DAG
directives. Thus, this patch also removes uses of FileCheck's
-allow-deprecated-dag-overlap command-line option.
Specifically, the FileCheck variables DBG_LOC_START, DBG_LOC_END, and
DBG_LOC_CANCEL were all set to the same value. As a result, three
TERM_DEBUG-DAG patterns, one for each variable, all matched the same
text under the old overlapping behavior. Under the new
non-overlapping behavior, that's not permitted. This patch's solution
is to replace these variables with one variable and replace these
patterns with one pattern.
Reviewed By: ABataev
Differential Revision: https://reviews.llvm.org/D54764
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@347350
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