There was an optimization that skipped a [0, 1] clamp for a particular sampling mode as it assumed
the input coordinates were always within these bounds.

However, if the texture sample coordinates were inf or NaN, this assumption broke, causing the
returned address to be outside the bounds of the image data.

Bug: b/123731195
Bug: b/124368982
Change-Id: I0af34ee4c2792b19081d9270fd0b1e0d0559287e
Reviewed-on: https://swiftshader-review.googlesource.com/c/24868Reviewed-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>