Merge remote-tracking branch 'origin/master' into stage2-whole-file-astgen

In particular I wanted the change that makes `suspend;` illegal in the
parser.

src/codegen.zig

@@ -1247,7 +1247,6 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
                 },
                 .stack_offset => |off| {
                     log.debug("reusing stack offset {} => {*}", .{ off, inst });
-                    return true;
                 },
                 else => return false,
             }