X86: Remove double-cast in Cvtf2i micro-op
X86: Remove double-cast in Cvtf2i micro-op

This double cast led to rounding errors which caused
some benchmarks to get the wrong values, most notably lucas
which failed spectacularly due to CVTTSD2SI returning an
off-by-one value.  equake was also broken.

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