[turbofan] Introduce CheckTaggedSigned and CheckTaggedPointer operators.

src/compiler/wasm-compiler.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/wasm-compiler.h"
 
 #include "src/isolate-inl.h"
 
 #include "src/base/platform/elapsed-timer.h"
 #include "src/base/platform/platform.h"
@@ skipping 2284 matching lines @@
 
 Node* WasmGraphBuilder::BuildAllocateHeapNumberWithValue(Node* value,
                                                          Node* control) {
   MachineOperatorBuilder* machine = jsgraph()->machine();
   CommonOperatorBuilder* common = jsgraph()->common();
   // The AllocateHeapNumberStub does not use the context, so we can safely pass
   // in Smi zero here.
   Callable callable = CodeFactory::AllocateHeapNumber(jsgraph()->isolate());
   Node* target = jsgraph()->HeapConstant(callable.code());
   Node* context = jsgraph()->NoContextConstant();
-  Node* effect = graph()->NewNode(common->BeginRegion(), graph()->start());
+  Node* effect =
+      graph()->NewNode(common->BeginRegion(RegionObservability::kNotObservable),
+                       graph()->start());
   if (!allocate_heap_number_operator_.is_set()) {
     CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
         jsgraph()->isolate(), jsgraph()->zone(), callable.descriptor(), 0,
         CallDescriptor::kNoFlags, Operator::kNoThrow);
     allocate_heap_number_operator_.set(common->Call(descriptor));
   }
   Node* heap_number = graph()->NewNode(allocate_heap_number_operator_.get(),
                                        target, context, effect, control);
   Node* store =
       graph()->NewNode(machine->Store(StoreRepresentation(
@@ skipping 947 matching lines @@
                             function_->code_start_offset),
            compile_ms);
   }
 
   return code;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8