Compiler crash when casting slice to relative slice

[Tetralux]

• Operating System & Odin Version: Windows x64, odin.exe version dev-2022-03:bff5a67f

package test

import "core:fmt"

main :: proc() {
	Slice16 :: #relative(u16) []byte

	a := [4]byte{1, 2, 3, 4}
	s := cast(Slice16) a[:]
	fmt.println(s)
}

test.main
lb_emit_conv: src -> dst
Not Identical []u8 != #relative(u16) []u8
Not Identical []u8 != #relative(u16) []u8
Not Identical 138f31a8890 != 138f0b3ff10
Not Identical 138f31a8890 != 138f0b3ff10
src\llvm_backend_expr.cpp(2127): Panic: Invalid type conversion: '[]u8' to '#relative(u16) []u8' for procedure 'test.main'

Note: cast(#relative(u16) []byte) a[:] fails with an Expected a type, got #relative(u16)[]byte compiler error.

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