[turbofan] Clean up and factor out branch generation logic.

src/compiler/code-generator.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_CODE_GENERATOR_H_
 #define V8_COMPILER_CODE_GENERATOR_H_
 
 #include <deque>
 
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/instruction.h"
 #include "src/deoptimizer.h"
 #include "src/macro-assembler.h"
 #include "src/safepoint-table.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 class Linkage;
 
+struct BranchInfo {
+  FlagsCondition condition;
+  Label* true_label;
+  Label* false_label;
+  bool fallthru;
+};
+
+
 // Generates native code for a sequence of instructions.
 class CodeGenerator FINAL : public GapResolver::Assembler {
  public:
   explicit CodeGenerator(Frame* frame, Linkage* linkage,
                          InstructionSequence* code, CompilationInfo* info);
 
   // Generate native code.
   Handle<Code> GenerateCode();
 
   InstructionSequence* code() const { return code_; }
@@ skipping 21 matching lines @@
   // Assemble code for the specified instruction.
   void AssembleInstruction(Instruction* instr);
   void AssembleSourcePosition(SourcePositionInstruction* instr);
   void AssembleGap(GapInstruction* gap);
 
   // ===========================================================================
   // ============= Architecture-specific code generation methods. ==============
   // ===========================================================================
 
   void AssembleArchInstruction(Instruction* instr);
-  void AssembleArchBranch(Instruction* instr, FlagsCondition condition);
+  void AssembleArchJump(BasicBlock::RpoNumber target);
+  void AssembleArchBranch(Instruction* instr, BranchInfo* branch);
   void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
 
   void AssembleDeoptimizerCall(int deoptimization_id);
 
   // Generates an architecture-specific, descriptor-specific prologue
   // to set up a stack frame.
   void AssemblePrologue();
   // Generates an architecture-specific, descriptor-specific return sequence
   // to tear down a stack frame.
   void AssembleReturn();
@@ skipping 60 matching lines @@
   ZoneDeque<Handle<Object> > deoptimization_literals_;
   TranslationBuffer translations_;
   int last_lazy_deopt_pc_;
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_CODE_GENERATOR_H