Revert "Mark instantiated function decls as inline specified if any pattern is"

Revert "Mark instantiated function decls as inline specified if any pattern is"

It breaks down on this test case:
  void foo();
  template <typename T> class C {
    friend void foo();
  };
  inline void foo() {}
  C<int> c;

We shouldn't be marking the instantiation of the friend decl of foo as
inline-specified. It may be possible to fix this by determining if the
full definition is part of the current template, but it seems better to
rever tot green until we come up with a full solution.

This reverts commit r233817, as well as follow-ups r233820 and r233821.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@234355 91177308-0d34-0410-b5e6-96231b3b80d8