Do not allow occupancy restriction on cooperative groups.

Excessive scratch allocations can normally trigger occupancy
reduction.  This breaks cooperative groups so if occupancy
reduction is required on a cooperative dispatch fail with OOM.

Change-Id: I64612a2e38bf1286f3b74c1c2a68ab0c85452771

runtime/hsa-runtime/core/inc/scratch_cache.h

@@ -94,11 +94,12 @@ class ScratchCache {
     size_t size_per_thread;
     uint32_t lanes_per_wave;
     uint32_t waves_per_group;
+    uint64_t wanted_slots;
+    bool cooperative;
     ptrdiff_t queue_process_offset;
     bool large;
     bool retry;
     hsa_signal_t queue_retry;
-    uint64_t wanted_slots;
     ScratchCache::ref_t scratch_node;
   };