JIT: Fix improperly contained BroadcastScalarToVector(CreateScalar(GT_LONG))

[saucecontrol]

Fixes #113832 (comment)

This was another case where CreateScalar([GT_LONG]) was improperly assumed to be containable in a broadcast, which in turn allowed the broadcast to be contained in another instruction as an EVEX embedded broadcast. It was assumed that if the CreateScalar contained its operand, it was a memory load, and a broadcast could peek through to the memory operand.

[JulieLeeMSFT]

@BruceForstall, PTAL.

[saucecontrol]

Last commit adds a second fix for this issue. Either works in isolation, but this resolves the broken pattern from two sides.

1. Since BroadcastScalarToVector attempts to look through its HWIntrinsic operand, we make sure it can see through both CreateScalar and CreateScalarUnsafe for the containment check, where it will see that GT_LONG is not containable as a memory op.
2. For anything else that attempts to contain a CreateScalar/Unsafe, a contained GT_LONG will not result in the incorrect assumption that the CreateScalar/Unsafe is a memory load.