[turbofan] Also optimize unsigned division by constant.

src/x64/assembler-x64.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 792 matching lines @@
   }
 
   void decb(Register dst);
   void decb(const Operand& dst);
 
   // Sign-extends rax into rdx:rax.
   void cqo();
   // Sign-extends eax into edx:eax.
   void cdq();
 
+  // Multiply eax by src, put the result in edx:eax.
+  void mull(Register src);
+  void mull(const Operand& src);
   // Multiply rax by src, put the result in rdx:rax.
-  void mul(Register src);
+  void mulq(Register src);
 
 #define DECLARE_SHIFT_INSTRUCTION(instruction, subcode)                       \
   void instruction##p(Register dst, Immediate imm8) {                         \
     shift(dst, imm8, subcode, kPointerSize);                                  \
   }                                                                           \
                                                                               \
   void instruction##l(Register dst, Immediate imm8) {                         \
     shift(dst, imm8, subcode, kInt32Size);                                    \
   }                                                                           \
                                                                               \
@@ skipping 641 matching lines @@
 
   // Divide rdx:rax by src.  Quotient in rax, remainder in rdx when size is 64.
   // Divide edx:eax by lower 32 bits of src.  Quotient in eax, remainder in edx
   // when size is 32.
   void emit_idiv(Register src, int size);
   void emit_div(Register src, int size);
 
   // Signed multiply instructions.
   // rdx:rax = rax * src when size is 64 or edx:eax = eax * src when size is 32.
   void emit_imul(Register src, int size);
+  void emit_imul(const Operand& src, int size);
   void emit_imul(Register dst, Register src, int size);
   void emit_imul(Register dst, const Operand& src, int size);
   void emit_imul(Register dst, Register src, Immediate imm, int size);
   void emit_imul(Register dst, const Operand& src, Immediate imm, int size);
 
   void emit_inc(Register dst, int size);
   void emit_inc(const Operand& dst, int size);
 
   void emit_lea(Register dst, const Operand& src, int size);
 
@@ skipping 134 matching lines @@
  private:
   Assembler* assembler_;
 #ifdef DEBUG
   int space_before_;
 #endif
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_X64_ASSEMBLER_X64_H_