cpu: Fix barrier push to store buffer when full bug in Minor
cpu: Fix barrier push to store buffer when full bug in Minor

This patch fixes a bug where a completing load or store which is also a
barrier can push a barrier into the store buffer without first checking
that there is a free slot.

The bug was not fatal but would print a warning that the store buffer
was full when inserting.

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