Remove redundant check of is_soo() while prefetching heap blocks.

PiperOrigin-RevId: 640620462
Change-Id: I72c0a7f0f549404ad8310b8cebd7dd491341390b

absl/container/internal/raw_hash_set.h

@@ -3887,7 +3887,7 @@ class raw_hash_set {
   // cache misses. This is intended to overlap with execution of calculating the
   // cache misses. This is intended to overlap with execution of calculating the
   // hash for a key.
   // hash for a key.
   void prefetch_heap_block() const {
   void prefetch_heap_block() const {
-    if (is_soo()) return;
+    assert(!is_soo());
 #if ABSL_HAVE_BUILTIN(__builtin_prefetch) || defined(__GNUC__)
 #if ABSL_HAVE_BUILTIN(__builtin_prefetch) || defined(__GNUC__)
     __builtin_prefetch(control(), 0, 1);
     __builtin_prefetch(control(), 0, 1);
 #endif
 #endif