Adding new AST matchers for: addrLabelExpr, atomicExpr, binaryConditionalOperator, designatedInitExpr, designatorCountIs, hasSyntacticForm, implicitValueInitExpr, labelDecl, opaqueValueExpr, parenListExpr, predefinedExpr, requiresZeroInitialization, and stmtExpr.

Patch by Aleksei Sidorin.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@263027 91177308-0d34-0410-b5e6-96231b3b80d8