[patterns] Fix a handful of small-ish patterns issues: #2779
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Allow object pattern fields to tear off methods.
No exception for non-exhaustive switch statements that don't need
to be exhaustive.
Promoted types and bounds can be always-exhaustive.
Fix incorrect static error with cast patterns in assignments.
Clarify that patterns are not const contexts.
Fix #2561.
Fix #2698.
Fix #2765.
Fix #2758.