The grammar for GNU typeof in C requires an expression to be

The grammar for GNU typeof in C requires an expression to be
parenthesized, unlike in C++, e.g.,

  C has: typeof ( expression)
  C++ has: typeof unary-expression

So, once we've parsed a parenthesized expression after typeof, we
should only go on to parse the postfix expression suffix if we're in
C++. Fixes <rdar://problem/8237491>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@109606 91177308-0d34-0410-b5e6-96231b3b80d8