LLVM: fix tripping assertions

Packed structs were tripping an LLVM assertion due to calling
`LLVMConstZExt` from i16 to i16. Solved by using instead
`LLVMConstZExtOrBitCast`.

Unions were tripping an LLVM assertion due to a typo using the union
llvm type to construct an integer value rather than the tag type.

1 files changed, 2 insertions, 2 deletions

diff --git a/test/behavior/struct.zig b/test/behavior/struct.zig
index fb4a7c4946..13fe0820ce 100644
--- a/test/behavior/struct.zig
+++ b/test/behavior/struct.zig
@@ -871,10 +871,10 @@ test "non-packed struct with u128 entry in union" {
 
     var sx: S = undefined;
     var s = &sx;
-    try std.testing.expect(@ptrToInt(&s.f2) - @ptrToInt(&s.f1) == @offsetOf(S, "f2"));
+    try expect(@ptrToInt(&s.f2) - @ptrToInt(&s.f1) == @offsetOf(S, "f2"));
     var v2 = U{ .Num = 123 };
     s.f2 = v2;
-    try std.testing.expect(s.f2.Num == 123);
+    try expect(s.f2.Num == 123);
 }
 
 test "packed struct field passed to generic function" {