nv50/ir/nir: fix cache mode conversion

The nir access qualifier is actually a bitfield, so we need to read out
like one.

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5747>

src/gallium/drivers/nouveau/codegen/nv50_ir_from_nir.cpp

@@ -2938,14 +2938,11 @@ Converter::getNIRArgCount(TexInstruction::Target& target)
 CacheMode
 Converter::convert(enum gl_access_qualifier access)
 {
-   switch (access) {
-   case ACCESS_VOLATILE:
+   if (access & ACCESS_VOLATILE)
       return CACHE_CV;
-   case ACCESS_COHERENT:
+   if (access & ACCESS_COHERENT)
       return CACHE_CG;
-   default:
-      return CACHE_CA;
-   }
+   return CACHE_CA;
 }
 
 bool