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Fix infinite recursion in deferred diag emitter

Authored by yaxunl on Mar 27 2020, 9:38 AM.

Description

Fix infinite recursion in deferred diag emitter

Currently deferred diagnostic emitter checks variable decl in DeclRefExpr, which
causes infinite recursion for cases like long a = (long)&a;.

Deferred diagnostic emitter does not need check variable decls in DeclRefExpr
since reference of a variable does not cause emission of functions directly or
indirectly. Therefore there is no need to check variable decls in DeclRefExpr.

Differential Revision: https://reviews.llvm.org/D76937