In WebAssembly, `main` function is mangled differently depending on if
it takes argc/argv or not. If it doesn't take them, it's mangled to
`main` as well as other platforms, so remove unused argc/argv in
executable tests to avoid linkage failure.
When a metadata pack is heap allocated, the pointer's LSB is set.
But lldb is expecting a real pointer. So mask it off.
Companion PR has a test: https://github.com/apple/llvm-project/pull/6961
rdar://110195273
Previously, only the element archetypes that corresponded to the
relevant pack generic parameters were bound, and the wtables that were
bound for them were based on looking up what they conform to. Here, the
requirements of the generic signature are used to find which archetypes
must be bound to metadata and which conformances must be bound to
wtables.
Previously, the test didn't actually verify that the called witness
method was the witness method from the right method--all the methods had
the same implementation and just forwarded the type along to be printed.
Now an id specific to each method is printed as well.
Previously wtable packs were never forwarded because pack types
consisting of a single element which was itself a pack archetype were
never canonicalized into that.
In the forwarding scenario, gepped and loaded from wtable when lowering
open_pack_element.
Call out to the infrastructure for emitting witness table packs to emit
references to individual witness tables when binding opened archetypes
during open_pack_element.
