Zir: add missing extra index for linksection_or_addspace

Closes #18052
Closes #18104

Signed-off-by: Tw <[email protected]>

Author: tw4452852

src/Zir.zig

@@ -3416,8 +3416,9 @@ pub const DeclIterator = struct {
         it.extra_index += 5; // src_hash(4) + line(1)
         const name = it.zir.nullTerminatedString(it.zir.extra[it.extra_index]);
         it.extra_index += 3; // name(1) + value(1) + doc_comment(1)
-        it.extra_index += @as(u1, @truncate(flags >> 2));
-        it.extra_index += @as(u1, @truncate(flags >> 3));
+        it.extra_index += @as(u1, @truncate(flags >> 2)); // align
+        it.extra_index += @as(u1, @truncate(flags >> 3)); // link_section
+        it.extra_index += @as(u1, @truncate(flags >> 3)); // address_space
 
         return Item{
             .sub_index = sub_index,

test/behavior.zig

@@ -228,6 +228,7 @@ test {
     _ = @import("behavior/type.zig");
     _ = @import("behavior/type_info.zig");
     _ = @import("behavior/type_info_only_pub_decls.zig");
+    _ = @import("behavior/type_info_mul_linksection_addrspace_decls.zig");
     _ = @import("behavior/typename.zig");
     _ = @import("behavior/undefined.zig");
     _ = @import("behavior/underscore.zig");

test/behavior/type_info_mul_linksection_addrspace_decls.zig

@@ -0,0 +1,12 @@
+const std = @import("std");
+const expect = std.testing.expect;
+
+pub const a linksection("sec_a") = 0;
+pub const b linksection("sec_b") = 0;
+pub const c addrspace("space_c") = 0;
+pub const d addrspace("space_d") = 0;
+
+test {
+    const decls = @typeInfo(@This()).Struct.decls;
+    try expect(decls.len == 4);
+}