SwiftDriver: use clang++
as linker driver with C++ Interop
#1023
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This adjusts the linker job construction to switch the linker driver to
the C++ compiler driver as the linker driver when C++ interop is
enabled. This allows us to ensure that we properly link against the C++
runtime which should be assumed to be needed with C++ interop. This is
required for further exploration of C++ interop.