When instantiating a function that was declared via a typedef, e.g.,

When instantiating a function that was declared via a typedef, e.g.,

    typedef int functype(int, int);
    functype func;

also instantiate the synthesized function parameters for the resulting
function declaration.

With this change, Boost.Wave builds and passes all of its regression
tests.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@103025 91177308-0d34-0410-b5e6-96231b3b80d8