LLVM backend assertion fails with global pointer struct literal with union inside

[EeroMutka]

the compiler crashes with the following program:

package main
import "core:fmt"

Foo :: struct { x: int }
Bar :: struct { x: int }

Baz :: struct {
	variant: union { Foo, Bar },
}

global := &Baz{Foo{2}}

main :: proc() {
	fmt.println("foo", global)
}

output:

c:\dev\odin\src\llvm_backend_general.cpp(2466): Assertion Failure: `LLVMIsConstant(value.value)`    = load main.Baz, main.Baz* , align 8

Odin: dev-2021-12:db42a2db OS: Windows 10 Professional (version: 21H1), build 19043.1348 CPU: Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz RAM: 16303 MiB

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