[Clang][HLSL][GVN] Prevent phi codgen of isTokenLike types (#162363)

fixes #161754

When the GVN pass calls `PerformLoadPRE` or `processNonLocalLoad` it can
invoke the `SSAUpdater` which adds a phi node for our tokenLike type. If
we check for if the load is on a token like type at the `processLoad` we
can cover both cases. This is because if we don't GVN will use the
SSAUpdater to insert a phi node to reduce duplicate resource.getpointer
calls.

Because in an earlier commit:
https://github.com/llvm/llvm-project/commit/01c0a8409a21344c822deba9467bd9d547f6e5d8
we made the verifier error with `PHI nodes cannot have token type!`

This test case will fail today if we try to perform this load
optimization
https://godbolt.org/z/xM69fY8zM

This will impact clang aswell because `isTokenLikeTy` also checks for
`isTokenTy` Clang is likely also failing validation with token types but
just doesn't have a test case because the validator would error if it
were in a phi node.

0 files changed, 0 insertions, 0 deletions