Revert of [turbofan] Run everything after representation selection concurrently.

src/compiler/instruction.h

 // 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.
 
 #ifndef V8_COMPILER_INSTRUCTION_H_
 #define V8_COMPILER_INSTRUCTION_H_
 
 #include <deque>
 #include <iosfwd>
 #include <map>
@@ skipping 982 matching lines @@
   ExternalReference ToExternalReference() const {
     DCHECK_EQ(kExternalReference, type());
     return bit_cast<ExternalReference>(static_cast<intptr_t>(value_));
   }
 
   RpoNumber ToRpoNumber() const {
     DCHECK_EQ(kRpoNumber, type());
     return RpoNumber::FromInt(static_cast<int>(value_));
   }
 
-  Handle<HeapObject> ToHeapObject() const;
+  Handle<HeapObject> ToHeapObject() const {
+    DCHECK_EQ(kHeapObject, type());
+    return bit_cast<Handle<HeapObject> >(static_cast<intptr_t>(value_));
+  }
 
  private:
   Type type_;
   int64_t value_;
 #if V8_TARGET_ARCH_32_BIT
   RelocInfo::Mode rmode_ = RelocInfo::NONE32;
 #else
   RelocInfo::Mode rmode_ = RelocInfo::NONE64;
 #endif
 };
@@ skipping 412 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os,
                          const PrintableInstructionSequence& code);
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_INSTRUCTION_H_