075f93fa10
This change provides a basic implementation of #2349 for stage2. There's
still quite a lot of work before this logic is as complete as what's in
Clang (b364535304/clang/lib/CodeGen/CGStmt.cpp (L2304-L2795)),
particularly considering the diversity of constraints across targets.
It's probably not worth doing the complete work until there's a clearer
picture for constraints in Zig's future dedicated ASM syntax, but at
least this gives us a small improvement for now.
As a bonus, this also fixes a bug with how we were handling `_`
identifiers.
A general-purpose programming language and toolchain for maintaining robust, optimal, and reusable software.
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