* Reduce branching in Type.eql and Type.hash for error sets.
* `Type.eql` uses element-wise bytes comparison since it can rely on
the error sets being pre-sorted.
* Avoid unnecessarily skipping tests that are passing.
This implements type equality for error sets. This is done
through element-wise error set comparison.
Inferred error sets are always distinct types and other error sets are
always sorted. See #11022.
This also adds `std.sort.sortContext` and
`std.sort.insertionSortContext` which are more advanced methods that
allow overriding the `swap` method. The former calls the latter for now
because reworking the main sort implementation is a big task that can be
done later without any changes to the API.
When the anytype parameter had only one-possible-value
(e.g. `void`), it would create a mismatch in the function type and the
function call. Now the function type and the callsite both omit the
one-possible-value anytype parameter in instantiated generic functions.
This implements the initial fptrunc instruction. For all other floating-point truncating,
a call to compiler-rt is required. (This also updates fpext to emit the same error).
- Implement switching over booleans and pointers.
- Fix sparse-detection where the lowest value was never truly set
as it started at a non-zero number and the case was > 50.
- Fix indexing the jump table by ensuring it starts indexing from 0.
This required adjusting `Type.nameAlloc` to be used with a
general-purpose allocator and added `Type.nameAllocArena` for the arena
use case (avoids allocation sometimes).
Previously, we did this so that we could insert a debug variable
declaration intrinsic on the alloca. But there is a dbg.value intrinsic
for declaring variables that are values.
The comment notes that we can't because of constness, but the recent
work by @Vexu lets us use the bitcast ty cause constness comes later.
The following tests pass from this:
```
test "A" {
const ary = [_:0]u8{42};
const ptr: [*:0]const u8 = &ary;
try expect(ptr[1] == 0);
}
test "B" {
comptime {
const ary = [_:0]u8{42};
const ptr: [*:0]const u8 = &ary;
try expect(ptr[1] == 0);
}
}
```
By the time zirElemVal is reached for a many pointer, a load has already
happened, making sure the operand is already dereferenced.
This makes `mem.sliceTo` now work.
