Auto merge of #12582 - kpreid:stacksize, r=Manishearth

`large_stack_frames`: print total size and largest component.

Instead of just saying “this function's stack frame is big”, report:

* the (presumed) size of the frame
* the size and type of the largest local contributing to that size
* the configurable limit that was exceeded (once)

Known issues:

* The lint may report an over-estimate because codegen may be able to overlap some of these locals. However, that already affected whether the lint fired at all; I believe this change is still an improvement because it gives the user much more actionable information about _why_ the lint fired.
* Please tell me a better way to determine whether a local has a variable name.

changelog: [`large_stack_frames`]: print total size and largest component.

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