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To avoid this PR regressing error messages, most of the work here has gone towards improving error notes for why code was comptime-evaluated. ZIR `block_comptime` now stores a "comptime reason", the enum for which is also used by Sema. There are two types in Sema: * `ComptimeReason` represents the reason we started evaluating something at comptime. * `BlockComptimeReason` represents the reason a given block is evaluated at comptime; it's either a `ComptimeReason` with an attached source location, or it's because we're in a function which was called at comptime (and that function's `Block` should be consulted for the "parent" reason). Every `Block` stores a `?BlockComptimeReason`. The old `is_comptime` field is replaced with a trivial `isComptime()` method which returns whether that reason is non-`null`. Lastly, the handling for `block_comptime` has been simplified. It was previously going through an unnecessary runtime-handling path; now, it is a trivial sub block exited through a `break_inline` instruction. Resolves: #22296