Make sure the good old "function/array conversion" is done to function parameters.

This resulted in the following error...

[dylan:clang/test/Parser] admin% cat parmvardecl_conversion.c 
// RUN: clang -parse-ast-check %s

void f (int p[]) { p++; }

[dylan:clang/test/Parser] admin% clang -parse-ast-check parmvardecl_conversion.c 
Errors seen but not expected:
  Line 3: cannot modify value of type 'int []'

With this fix, the test case above succeeds.

llvm-svn: 40831