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Takes advantage of the pattern already established with
array_init_anon. Also upgrades array_init (non-anon) to the pattern.
Implements comptime struct value equality and pointer value hashing.
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Before this commit, Zig would incorrectly emit `arg` AIR instructions
for parameters whose types were 0-bit.
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When doing LLVM const bit shifting we must make sure the integer bit
sizes are wide enough or else LLVM gives us a poison result.
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Introduced a new AIR instruction: `tag_name`. Reasons to do this
instead of lowering it in Sema to a switch, function call, array
lookup, or if-else tower:
* Sema is a bottleneck; do less work in Sema whenever possible.
* If any optimization passes run, and the operand to becomes
comptime-known, then it could change to have a comptime result
value instead of lowering to a function or array or something which
would then have to be garbage-collected.
* Backends may want to choose to use a function and a switch branch,
or they may want to use a different strategy.
Codegen for `@tagName` is implemented for the LLVM backend but not any
others yet.
Introduced some new `Type` tags:
* `const_slice_u8_sentinel_0`
* `manyptr_const_u8_sentinel_0`
The motivation for this was to make typeof() on the tag_name AIR
instruction non-allocating.
A bunch more enum tests are passing now.
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