[memprof] Drop the trait parameter (NFC) (#89461)

OnDiskIterableChainedHashTable::Create can default-contruct a trait
object for us.  We don't need to construct one on our own unless we
need to customize something (like a version number).

Author: kazutakahirata

llvm/lib/ProfileData/InstrProfReader.cpp

@@ -1272,13 +1272,13 @@ Error IndexedMemProfReader::deserialize(const unsigned char *Start,
   MemProfFrameTable.reset(MemProfFrameHashTable::Create(
       /*Buckets=*/Start + FrameTableOffset,
       /*Payload=*/Start + FramePayloadOffset,
-      /*Base=*/Start, memprof::FrameLookupTrait()));
+      /*Base=*/Start));
 
   if (Version >= memprof::Version2)
     MemProfCallStackTable.reset(MemProfCallStackHashTable::Create(
         /*Buckets=*/Start + CallStackTableOffset,
         /*Payload=*/Start + CallStackPayloadOffset,
-        /*Base=*/Start, memprof::CallStackLookupTrait()));
+        /*Base=*/Start));
 
 #ifdef EXPENSIVE_CHECKS
   // Go through all the records and verify that CSId has been correctly