[OPENMP] Emit an additional note during analysis of 'if' clause.

[OPENMP] Emit an additional note during analysis of 'if' clause.
Patch adds emission of additional note for 'if' clauses with name modifiers in case if 'if' clause without name modified was specified or 'if' clause with the same name modifier was specified.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@247706 91177308-0d34-0410-b5e6-96231b3b80d8