Rollup of 6 pull requests

[matthiaskrgr]

Successful merges:

• Add inherent versions of MaybeUninit methods for slices #129259 (Add inherent versions of MaybeUninit methods for slices)
• Suggest typo fix when trait path expression is typo'ed #135374 (Suggest typo fix when trait path expression is typo'ed)
• Make MIR cleanup for functions with impossible predicates into a real MIR pass #135377 (Make MIR cleanup for functions with impossible predicates into a real MIR pass)
• Remove a bunch of diagnostic stashing that doesn't do anything #135378 (Remove a bunch of diagnostic stashing that doesn't do anything)
• compiletest: add erroneous variant to string_enums conversions error #135397 (compiletest: add erroneous variant to string_enums conversions error)
• add more crash tests #135398 (add more crash tests)

r? @ghost
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