clang-format: Make formatting of member function reference qualifiers

more consistent.

Before:
  SomeType MemberFunction(const Deleted &)&&;
  SomeType MemberFunction(const Deleted &) && { ... }

After:
  SomeType MemberFunction(const Deleted &)&&;
  SomeType MemberFunction(const Deleted &)&& { ... }

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@245843 91177308-0d34-0410-b5e6-96231b3b80d8