X86: Implement the fence instructions. These are not microcoded.
X86: Implement the fence instructions. These are not microcoded.

aclifton/cpeg853-gem5,gedare/gem5,yb-kim/gemV,rjschof/gem5,qizenguf/MLC-STT,briancoutinho0905/2dsampling,SanchayanMaity/gem5,markoshorro/gem5,HwisooSo/gemV-update,KuroeKurose/gem5,yb-kim/gemV,cancro7/gem5,powerjg/gem5-ci-test,yb-kim/gemV,TUD-OS/gem5-dtu,gedare/gem5,gem5/gem5,rallylee/gem5,joerocklin/gem5,sobercoder/gem5,powerjg/gem5-ci-test,HwisooSo/gemV-update,gem5/gem5,aclifton/cpeg853-gem5,kaiyuanl/gem5,HwisooSo/gemV-update,joerocklin/gem5,kaiyuanl/gem5,austinharris/gem5-riscv,samueldotj/TeeRISC-Simulator,rallylee/gem5,gem5/gem5,joerocklin/gem5,markoshorro/gem5,joerocklin/gem5,austinharris/gem5-riscv,powerjg/gem5-ci-test,rallylee/gem5,cancro7/gem5,kaiyuanl/gem5,qizenguf/MLC-STT,joerocklin/gem5,Weil0ng/gem5,KuroeKurose/gem5,sobercoder/gem5,yb-kim/gemV,SanchayanMaity/gem5,gedare/gem5,sobercoder/gem5,kaiyuanl/gem5,gedare/gem5,qizenguf/MLC-STT,SanchayanMaity/gem5,briancoutinho0905/2dsampling,Weil0ng/gem5,zlfben/gem5,cancro7/gem5,gedare/gem5,rjschof/gem5,rallylee/gem5,briancoutinho0905/2dsampling,austinharris/gem5-riscv,kaiyuanl/gem5,samueldotj/TeeRISC-Simulator,aclifton/cpeg853-gem5,joerocklin/gem5,TUD-OS/gem5-dtu,yb-kim/gemV,HwisooSo/gemV-update,TUD-OS/gem5-dtu,sobercoder/gem5,SanchayanMaity/gem5,cancro7/gem5,markoshorro/gem5,zlfben/gem5,gedare/gem5,SanchayanMaity/gem5,gedare/gem5,KuroeKurose/gem5,TUD-OS/gem5-dtu,powerjg/gem5-ci-test,aclifton/cpeg853-gem5,markoshorro/gem5,gem5/gem5,zlfben/gem5,cancro7/gem5,markoshorro/gem5,TUD-OS/gem5-dtu,briancoutinho0905/2dsampling,samueldotj/TeeRISC-Simulator,cancro7/gem5,rjschof/gem5,qizenguf/MLC-STT,gem5/gem5,joerocklin/gem5,samueldotj/TeeRISC-Simulator,HwisooSo/gemV-update,briancoutinho0905/2dsampling,KuroeKurose/gem5,HwisooSo/gemV-update,rjschof/gem5,TUD-OS/gem5-dtu,gem5/gem5,qizenguf/MLC-STT,zlfben/gem5,kaiyuanl/gem5,Weil0ng/gem5,zlfben/gem5,Weil0ng/gem5,briancoutinho0905/2dsampling,Weil0ng/gem5,rjschof/gem5,markoshorro/gem5,aclifton/cpeg853-gem5,yb-kim/gemV,yb-kim/gemV,austinharris/gem5-riscv,samueldotj/TeeRISC-Simulator,SanchayanMaity/gem5,KuroeKurose/gem5,KuroeKurose/gem5,rjschof/gem5,samueldotj/TeeRISC-Simulator,rallylee/gem5,zlfben/gem5,powerjg/gem5-ci-test,zlfben/gem5,qizenguf/MLC-STT,joerocklin/gem5,rallylee/gem5,KuroeKurose/gem5,austinharris/gem5-riscv,gem5/gem5,yb-kim/gemV,rallylee/gem5,aclifton/cpeg853-gem5,TUD-OS/gem5-dtu,Weil0ng/gem5,sobercoder/gem5,briancoutinho0905/2dsampling,powerjg/gem5-ci-test,aclifton/cpeg853-gem5,austinharris/gem5-riscv,sobercoder/gem5,HwisooSo/gemV-update,markoshorro/gem5,powerjg/gem5-ci-test,Weil0ng/gem5,qizenguf/MLC-STT,austinharris/gem5-riscv,cancro7/gem5,rjschof/gem5,sobercoder/gem5,SanchayanMaity/gem5,kaiyuanl/gem5,samueldotj/TeeRISC-Simulator