Fix tracing so it starts right away if --trace-start is not specified.
Fix tracing so it starts right away if --trace-start is not
specified.

--HG--
extra : convert_revision : 49c1ea0b8c313949124aed84b1055db0b3c55bd8

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