From a446101677e556c54a1633c430cb1611b2cdd5fe Mon Sep 17 00:00:00 2001
From: Jacob Young <jacobly0@users.noreply.github.com>
Date: Sat, 18 Jan 2025 01:56:36 -0500
Subject: [PATCH] x86_64: enable struct field reordering

The blocker for enabling this feature was my need to debug the emitted
assembly without debug info and having to manually inspect memory to
determine struct contents.  However, we now have debug info!

    (lldb) v -L foo bar
    0x00007fffffffda20: (repro.repro.Foo) foo = {
    0x00007fffffffda24:   .x = 12
    0x00007fffffffda20:   .y = 34
    }
    0x00007fffffffda28: (repro.repro.Bar) bar = {
    0x00007fffffffda28:   .x = 56
    0x00007fffffffda2c:   .y = 78
    }

Updates #21530
---
 src/target.zig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/target.zig b/src/target.zig
index d67fc797ce..b300d81123 100644
--- a/src/target.zig
+++ b/src/target.zig
@@ -720,7 +720,7 @@ pub inline fn backendSupportsFeature(backend: std.builtin.CompilerBackend, compt
             else => false,
         },
         .field_reordering => switch (backend) {
-            .stage2_c, .stage2_llvm => true,
+            .stage2_c, .stage2_llvm, .stage2_x86_64 => true,
             else => false,
         },
         .safety_checked_instructions => switch (backend) {