Fix _Ptr
source location bugs and remove workarounds from 3C.
#723
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As previously discussed in #657 and here, the Checked C compiler has a bug where it returns the wrong source locations for checked pointer types (not yet submitted to Microsoft's issue tracker). I'm planning to fix that bug and then remove 3C's workarounds for the bug. This draft PR currently contains both changes for convenience. When I'm ready, I'll submit a PR to Microsoft with only the compiler changes. After that PR is accepted and merged back to our repository, I'll update this PR to contain only the 3C changes.
I think the compiler part of this PR is done, but the 3C part needs a little more work, and it's possible (though unlikely) that I'll discover more problems in the compiler part during that process. Anyone interested in the PR can go ahead and look at it, but be warned that I'll likely force-push it later.