llvm: fix crashes when loading a struct field

The result of buildStructGEP is not always a GEP (sorry), so we can't
use getGEPResultElementType on it.

Closes #14641

1 files changed, 11 insertions, 0 deletions

diff --git a/test/behavior/union.zig b/test/behavior/union.zig
index 35bdca270e..20ad0a60ff 100644
--- a/test/behavior/union.zig
+++ b/test/behavior/union.zig
@@ -1529,3 +1529,14 @@ test "reinterpreting enum value inside packed union" {
     try U.doTest();
     comptime try U.doTest();
 }
+
+test "access the tag of a global tagged union" {
+    if (builtin.zig_backend == .stage2_aarch64) return error.SkipZigTest; // TODO
+
+    const U = union(enum) {
+        a,
+        b: u8,
+        var u: @This() = .a;
+    };
+    try expect(U.u == .a);
+}