assertion referencing `builtin` from module with different optimize mode in tests

[xdBronch]

Zig Version

0.15.0-dev.196+e9220525e

Steps to Reproduce and Observed Behavior

// main.zig
const mod = @import("mod");

test {
    _ = mod.builtin;
}

// mod.zig
pub const builtin = @import("builtin");

zig4 test --dep mod -OReleaseFast -Mroot=main.zig -ODebug -Mmod=mod.zig

thread 14213 panic: reached unreachable code
Analyzing mod.zig
    > %2 = import(.none, "builtin") 
      %3 = break_inline(%1, %2)
    For full context, use the command
      zig ast-check -t mod.zig

  in main.zig
    > %8 = field_val(%6, "builtin") 

/home/user/dev/zig/lib/std/debug.zig:546:14: 0x4cfec0d in assert (zig)
    if (!ok) unreachable; // assertion failure
             ^
/home/user/dev/zig/src/Zcu/PerThread.zig:1858:11: 0x51660d8 in semaFile (zig)
    assert(file.zir != null);
          ^
/home/user/dev/zig/src/Zcu/PerThread.zig:575:23: 0x500243a in ensureFileAnalyzed (zig)
    return pt.semaFile(file_index);
                      ^
/home/user/dev/zig/src/Sema.zig:14061:38: 0x5fc0688 in zirImport (zig)
            try pt.ensureFileAnalyzed(result.file_index);
                                     ^
/home/user/dev/zig/src/Sema.zig:1182:64: 0x5b4309c in analyzeBodyInner (zig)
            .import                       => try sema.zirImport(block, inst),
                                                               ^
/home/user/dev/zig/src/Sema.zig:1025:30: 0x573c77e in analyzeInlineBody (zig)
    if (sema.analyzeBodyInner(block, body)) |_| {
                             ^
/home/user/dev/zig/src/Sema.zig:1058:39: 0x536907e in resolveInlineBody (zig)
    return (try sema.analyzeInlineBody(block, body, break_target)) orelse .unreachable_value;
                                      ^
/home/user/dev/zig/src/Zcu/PerThread.zig:1077:58: 0x516949a in analyzeNavVal (zig)
            const result_ref = try sema.resolveInlineBody(&block, value_body, inst_resolved.inst);
                                                         ^
/home/user/dev/zig/src/Zcu/PerThread.zig:941:80: 0x5002983 in ensureNavValUpToDate (zig)
    const invalidate_value: bool, const new_failed: bool = if (pt.analyzeNavVal(nav_id)) |result| res: {
                                                                               ^
/home/user/dev/zig/src/Sema.zig:31763:49: 0x5365c5f in ensureNavResolved (zig)
        .fully => return pt.ensureNavValUpToDate(nav_index),
                                                ^
/home/user/dev/zig/src/Sema.zig:31791:31: 0x60810aa in analyzeNavRefInner (zig)
    try sema.ensureNavResolved(src, orig_nav_index, if (is_ref) .type else .fully);
                              ^
/home/user/dev/zig/src/Sema.zig:31682:44: 0x5f5b7ed in analyzeNavVal (zig)
    const ref = try sema.analyzeNavRefInner(src, nav_index, false);
                                           ^
/home/user/dev/zig/src/Sema.zig:27895:34: 0x649ec53 in namespaceLookupVal (zig)
    return try sema.analyzeNavVal(block, src, nav);
                                 ^
/home/user/dev/zig/src/Sema.zig:27373:56: 0x6499472 in fieldVal (zig)
                        if (try sema.namespaceLookupVal(block, src, child_type.getNamespaceIndex(zcu), field_name)) |inst| {
                                                       ^
/home/user/dev/zig/src/Sema.zig:10136:25: 0x5fbd9fa in zirFieldVal (zig)
    return sema.fieldVal(block, src, object, field_name, field_name_src);
                        ^
/home/user/dev/zig/src/Sema.zig:1177:66: 0x5b42f6c in analyzeBodyInner (zig)
            .field_val                    => try sema.zirFieldVal(block, inst),
                                                                 ^
/home/user/dev/zig/src/Sema.zig:1007:26: 0x5f52b41 in analyzeFnBody (zig)
    sema.analyzeBodyInner(block, body) catch |err| switch (err) {
                         ^
/home/user/dev/zig/src/Zcu/PerThread.zig:2708:23: 0x5af28d3 in analyzeFnBodyInner (zig)
    sema.analyzeFnBody(&inner_block, fn_info.body) catch |err| switch (err) {
                      ^
/home/user/dev/zig/src/Zcu/PerThread.zig:1625:40: 0x571a247 in analyzeFuncBody (zig)
    var air = try pt.analyzeFnBodyInner(func_index);
                                       ^
/home/user/dev/zig/src/Zcu/PerThread.zig:1545:66: 0x53583e6 in ensureFuncBodyUpToDate (zig)
    const ies_outdated, const new_failed = if (pt.analyzeFuncBody(func_index)) |result|
                                                                 ^
/home/user/dev/zig/src/Compilation.zig:4055:38: 0x51641a6 in processOneJob (zig)
            pt.ensureFuncBodyUpToDate(func) catch |err| switch (err) {
                                     ^

Expected Behavior

no crash!

[mlugg]

I've confirmed that this was resolved by #23836.