This change is effectively noop by itself, but allows the
floating point path to read all texture formats (except YUV).
This is required by the floating point path to be able to
perform higher precision filtering on all formats (except YUV).

Bug swiftshader:76

Change-Id: I5d0d24c00357b4b77cca2ca8a65d082db7635b40
Reviewed-on: https://swiftshader-review.googlesource.com/10668Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Alexis Hétu <sugoi@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>