Optimize HybridAllocator (#2637)

* Store constant `Operand`s in the `LocalInfo`

Since the spill slot and register assigned is fixed, we can just store
the `Operand` reference in the `LocalInfo` struct. This allows skipping
hitting the intern-table for a look up.

* Skip `Uses`/`Assignments` management

Since the `HybridAllocator` is the last pass and we do not care about
uses/assignments we can skip managing that when setting destinations or
sources.

* Make `GetLocalInfo` inlineable

Also fix a possible issue where with numbered locals. See or-assignment
operator in `SetVisited(local)` before patch.

* Do not run `BlockPlacement` in LCQ

With the host mapped memory manager, there is a lot less cold code to
split from hot code. So disabling this in LCQ gives some extra
throughput - where we need it.

* Address Mou-Ikkai's feedback

* Apply suggestions from code review

Co-authored-by: VocalFan <45863583+Mou-Ikkai@users.noreply.github.com>

* Move check to an assert

Co-authored-by: VocalFan <45863583+Mou-Ikkai@users.noreply.github.com>

ARMeilleure/IntermediateRepresentation/Operand.cs

@@ -146,6 +146,7 @@ namespace ARMeilleure.IntermediateRepresentation
             return BitConverter.Int64BitsToDouble((long)Value);
         }
 
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         internal ref ulong GetValueUnsafe()
         {
             return ref _data->Value;