Remove ~MaybeHandle and statically assert that handles are trivially copyable

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index 3b1902e076ff397b238d3f2cf17eb99611160db0..e4562eaf8e5a31c240ffd005f4ffc336dd06d304 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -12,6 +12,16 @@
 namespace v8 {
 namespace internal {
 
+// Handles should be trivially copyable so that they can be efficiently passed
+// by value. If they are not trivially copyable, they cannot be passed in
+// registers.
+static_assert(std::is_trivially_copyable<HandleBase>::value,
+              "HandleBase should be trivially copyable");
+static_assert(std::is_trivially_copyable<Handle<Object>>::value,
+              "Handle<Object> should be trivially copyable");
+static_assert(std::is_trivially_copyable<MaybeHandle<Object>>::value,
+              "MaybeHandle<Object> should be trivially copyable");
+
 #ifdef DEBUG
 bool HandleBase::IsDereferenceAllowed(DereferenceCheckMode mode) const {
   DCHECK_NOT_NULL(location_);