Again, I want to emphasize that I have no problems with CLANG 32-bit when debugging - all breakpoints are working as expected.
Why do not you just use clang 32?
It is a bit hard to support all existing toolchains in windows in the debugger, so let us say we only support bundled clang (and I see little reason to use anything else) and as backup/alternative visual c++ compiler.
mingw is not very suitable for any real development because linker is too slow.