Merge remote-tracking branch 'origin/master' into ast-memory-layout

Conflicts:
 * lib/std/zig/ast.zig
 * lib/std/zig/parse.zig
 * lib/std/zig/parser_test.zig
 * lib/std/zig/render.zig
 * src/Module.zig
 * src/zir.zig

I resolved some of the conflicts by reverting a small portion of
@tadeokondrak's stage2 logic here regarding `callconv(.Inline)`.
It will need to get reworked as part of this branch.

lib/std/zig.zig

@@ -140,6 +140,7 @@ pub fn binNameAlloc(allocator: *std.mem.Allocator, options: BinNameOptions) erro
             .Lib => return std.fmt.allocPrint(allocator, "{s}.wasm", .{root_name}),
         },
         .c => return std.fmt.allocPrint(allocator, "{s}.c", .{root_name}),
+        .spirv => return std.fmt.allocPrint(allocator, "{s}.spv", .{root_name}),
         .hex => return std.fmt.allocPrint(allocator, "{s}.ihex", .{root_name}),
         .raw => return std.fmt.allocPrint(allocator, "{s}.bin", .{root_name}),
     }