Update from https://crrev.com/305340

sandbox/linux/seccomp-bpf/instruction.h

-// Copyright (c) 2012 The Chromium 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 SANDBOX_LINUX_SECCOMP_BPF_INSTRUCTION_H__
-#define SANDBOX_LINUX_SECCOMP_BPF_INSTRUCTION_H__
-
-#include <stdint.h>
-
-#include <cstddef>
-
-namespace sandbox {
-
-// The fields in this structure have the same meaning as the corresponding
-// fields in "struct sock_filter". See <linux/filter.h> for a lot more
-// detail.
-// code     -- Opcode of the instruction. This is typically a bitwise
-//             combination BPF_XXX values.
-// k        -- Operand; BPF instructions take zero or one operands. Operands
-//             are 32bit-wide constants, if present. They can be immediate
-//             values (if BPF_K is present in "code_"), addresses (if BPF_ABS
-//             is present in "code_"), or relative jump offsets (if BPF_JMP
-//             and BPF_JA are present in "code_").
-// jt, jf   -- all conditional jumps have a 8bit-wide jump offset that allows
-//             jumps of up to 256 instructions forward. Conditional jumps are
-//             identified by BPF_JMP in "code_", but the lack of BPF_JA.
-//             Conditional jumps have a "t"rue and "f"alse branch.
-struct Instruction {
-  // Constructor for an non-jumping instruction or for an unconditional
-  // "always" jump.
-  Instruction(uint16_t c, uint32_t parm, Instruction* n)
-      : code(c), jt(0), jf(0), jt_ptr(NULL), jf_ptr(NULL), next(n), k(parm) {}
-
-  // Constructor for a conditional jump instruction.
-  Instruction(uint16_t c, uint32_t parm, Instruction* jt, Instruction* jf)
-      : code(c), jt(0), jf(0), jt_ptr(jt), jf_ptr(jf), next(NULL), k(parm) {}
-
-  uint16_t code;
-
-  // When code generation is complete, we will have computed relative
-  // branch targets that are in the range 0..255.
-  uint8_t jt, jf;
-
-  // While assembling the BPF program, we use pointers for branch targets.
-  // Once we have computed basic blocks, these pointers will be entered as
-  // keys in a TargetsToBlocks map and should no longer be dereferenced
-  // directly.
-  Instruction* jt_ptr, *jf_ptr;
-
-  // While assembling the BPF program, non-jumping instructions are linked
-  // by the "next_" pointer. This field is no longer needed when we have
-  // computed basic blocks.
-  Instruction* next;
-
-  uint32_t k;
-};
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_LINUX_SECCOMP_BPF_INSTRUCTION_H__