[turbofan] Make MachineType a pair of enums.

src/compiler/live-range-separator.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/live-range-separator.h"
 #include "src/compiler/register-allocator.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 27 matching lines @@
 
   if (start < end) {
     // Ensure the original range has a spill range associated, before it gets
     // splintered. Splinters will point to it. This way, when attempting to
     // reuse spill slots of splinters, during allocation, we avoid clobbering
     // such slots.
     if (range->MayRequireSpillRange()) {
       data->CreateSpillRangeForLiveRange(range);
     }
     if (range->splinter() == nullptr) {
-      TopLevelLiveRange *splinter = data->NextLiveRange(range->machine_type());
+      TopLevelLiveRange *splinter =
+          data->NextLiveRange(range->representation());
       DCHECK_NULL(data->live_ranges()[splinter->vreg()]);
       data->live_ranges()[splinter->vreg()] = splinter;
       range->SetSplinter(splinter);
     }
     Zone *zone = data->allocation_zone();
     TRACE("creating splinter for range %d between %d and %d\n", range->vreg(),
           start.ToInstructionIndex(), end.ToInstructionIndex());
     range->Splinter(start, end, zone);
   }
 }
@@ skipping 90 matching lines @@
     int to_remove = range->vreg();
     splinter_parent->Merge(range, data()->allocation_zone());
     data()->live_ranges()[to_remove] = nullptr;
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8