link.Dwarf: skip tests in updateComptimeNav

These won't live in the parent namespace as decls which causes problems
later in this function, and tests are guaranteed not to be referenced at
comptime anyway, so there's actually no need to run this logic.

Author: mlugg

src/link/Dwarf.zig

@@ -2477,6 +2477,18 @@ pub fn updateComptimeNav(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPool
     assert(file.zir_loaded);
     const decl_inst = file.zir.instructions.get(@intFromEnum(inst_info.inst));
     assert(decl_inst.tag == .declaration);
+    const decl_extra = file.zir.extraData(Zir.Inst.Declaration, decl_inst.data.declaration.payload_index);
+
+    const is_test = switch (decl_extra.data.name) {
+        .unnamed_test, .decltest => true,
+        .@"comptime", .@"usingnamespace" => false,
+        _ => decl_extra.data.name.isNamedTest(file.zir),
+    };
+    if (is_test) {
+        // This isn't actually a comptime Nav! It's a test, so it'll definitely never be referenced at comptime.
+        return;
+    }
+
     const tree = try file.getTree(dwarf.gpa);
     const loc = tree.tokenLocation(0, tree.nodes.items(.main_token)[decl_inst.data.declaration.src_node]);
     assert(loc.line == zcu.navSrcLine(nav_index));
@@ -2582,7 +2594,6 @@ pub fn updateComptimeNav(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPool
                 if (loaded_struct.zir_index == .none) break :decl_struct;
 
                 const value_inst = value_inst: {
-                    const decl_extra = file.zir.extraData(Zir.Inst.Declaration, decl_inst.data.declaration.payload_index);
                     const decl_value_body = decl_extra.data.getBodies(@intCast(decl_extra.end), file.zir).value_body;
                     const break_inst = file.zir.instructions.get(@intFromEnum(decl_value_body[decl_value_body.len - 1]));
                     if (break_inst.tag != .break_inline) break :value_inst null;
@@ -2704,7 +2715,6 @@ pub fn updateComptimeNav(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPool
                 if (loaded_enum.zir_index == .none) break :decl_enum;
 
                 const value_inst = value_inst: {
-                    const decl_extra = file.zir.extraData(Zir.Inst.Declaration, decl_inst.data.declaration.payload_index);
                     const decl_value_body = decl_extra.data.getBodies(@intCast(decl_extra.end), file.zir).value_body;
                     const break_inst = file.zir.instructions.get(@intFromEnum(decl_value_body[decl_value_body.len - 1]));
                     if (break_inst.tag != .break_inline) break :value_inst null;
@@ -2788,7 +2798,6 @@ pub fn updateComptimeNav(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPool
 
             decl_union: {
                 const value_inst = value_inst: {
-                    const decl_extra = file.zir.extraData(Zir.Inst.Declaration, decl_inst.data.declaration.payload_index);
                     const decl_value_body = decl_extra.data.getBodies(@intCast(decl_extra.end), file.zir).value_body;
                     const break_inst = file.zir.instructions.get(@intFromEnum(decl_value_body[decl_value_body.len - 1]));
                     if (break_inst.tag != .break_inline) break :value_inst null;
@@ -2911,7 +2920,6 @@ pub fn updateComptimeNav(dwarf: *Dwarf, pt: Zcu.PerThread, nav_index: InternPool
 
             decl_opaque: {
                 const value_inst = value_inst: {
-                    const decl_extra = file.zir.extraData(Zir.Inst.Declaration, decl_inst.data.declaration.payload_index);
                     const decl_value_body = decl_extra.data.getBodies(@intCast(decl_extra.end), file.zir).value_body;
                     const break_inst = file.zir.instructions.get(@intFromEnum(decl_value_body[decl_value_body.len - 1]));
                     if (break_inst.tag != .break_inline) break :value_inst null;