[turbofan] Various fixes to allow unboxed doubles as arguments in registers and on the stack.

src/compiler/register-allocator-verifier.cc

 // Copyright 2014 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/bit-vector.h"
 #include "src/compiler/instruction.h"
 #include "src/compiler/register-allocator-verifier.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 137 matching lines @@
     int value = imm->type() == ImmediateOperand::INLINE ? imm->inline_value()
                                                         : imm->indexed_value();
     constraint->type_ = kImmediate;
     constraint->value_ = value;
   } else {
     CHECK(op->IsUnallocated());
     const auto* unallocated = UnallocatedOperand::cast(op);
     int vreg = unallocated->virtual_register();
     constraint->virtual_register_ = vreg;
     if (unallocated->basic_policy() == UnallocatedOperand::FIXED_SLOT) {
-      constraint->type_ = kFixedSlot;
+      constraint->type_ = sequence()->IsFloat(vreg) ? kDoubleSlot : kSlot;
       constraint->value_ = unallocated->fixed_slot_index();
     } else {
       switch (unallocated->extended_policy()) {
         case UnallocatedOperand::ANY:
           CHECK(false);
           break;
         case UnallocatedOperand::NONE:
           if (sequence()->IsFloat(vreg)) {
             constraint->type_ = kNoneDouble;
           } else {
             constraint->type_ = kNone;
           }
           break;
         case UnallocatedOperand::FIXED_REGISTER:
           constraint->type_ = kFixedRegister;
           constraint->value_ = unallocated->fixed_register_index();
           break;
         case UnallocatedOperand::FIXED_DOUBLE_REGISTER:
           constraint->type_ = kFixedDoubleRegister;
           constraint->value_ = unallocated->fixed_register_index();
           break;
         case UnallocatedOperand::MUST_HAVE_REGISTER:
           if (sequence()->IsFloat(vreg)) {
             constraint->type_ = kDoubleRegister;
           } else {
             constraint->type_ = kRegister;
           }
           break;
         case UnallocatedOperand::MUST_HAVE_SLOT:
-          if (sequence()->IsFloat(vreg)) {
-            constraint->type_ = kDoubleSlot;
-          } else {
-            constraint->type_ = kSlot;
-          }
+          constraint->type_ = sequence()->IsFloat(vreg) ? kDoubleSlot : kSlot;
           break;
         case UnallocatedOperand::SAME_AS_FIRST_INPUT:
           constraint->type_ = kSameAsFirst;
           break;
       }
     }
   }
 }
 
 
@@ skipping 497 matching lines @@
         int virtual_register = op_constraints[count].virtual_register_;
         current->Define(zone(), instr->OutputAt(i), virtual_register);
       }
     }
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8