As LValue<T> overloads operator&(), there's no sensible way to get the address of the reactor type.

This is handy for storing a pointer to an Array or LValue in a field.

Bug: b/133213304
Change-Id: I950ee312005bc57187129f009578b8715973804a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33357Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>