IRgen: Switch the C++ mangler interfaces to take the SmallVector to write into,
instead of requiring clients to make a raw_svector_ostream, which is just an
implementation detail.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89548 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed