Auto merge of #43735 - est31:master, r=alexcrichton

Avoid calling the column!() macro in panic

Closes #43057

This "fix" adds a new macro called `__rust_unstable_column` and to use it instead of the `column` macro inside panic. The new macro can be shadowed as well as `column` can, but its very likely that there is no code that does this in practice.

There is no real way to make "unstable" macros that are usable by stable macros, so we do the next best thing and prefix the macro with `__rust_unstable` to make sure people recognize it is unstable.

r? @alexcrichton

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