Fence for RoCC on rocc-csr writes #833

Job	Run time
riscv-arch-test	0s
riscv-tests (DefaultConfig)	19m 14s
emulator (DefaultSmallConfig)	12m 46s
riscv-tests (DefaultBufferlessConfig)	19m 38s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	21m 47s
emulator (DualBankConfig)	13m 1s
riscv-tests (DefaultRV32Config)	19m 32s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	19m 53s
emulator (DualChannelConfig)	13m 15s
riscv-tests (TinyConfig)	13m 20s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 7s
emulator (DualChannelDualBankConfig)	13m 45s
riscv-tests (DefaultFP16Config)	14m 15s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	16m 57s
emulator (RoccExampleConfig)	13m 24s
emulator (Edge128BitConfig)	13m 25s
emulator (Edge32BitConfig)	13m 7s
emulator (QuadChannelBenchmarkConfig)	13m 13s
emulator (EightChannelConfig)	13m 42s
emulator (DualCoreConfig)	13m 40s
emulator (MemPortOnlyConfig)	13m 20s
emulator (MMIOPortOnlyConfig)	12m 52s
emulator (CloneTileConfig)	14m 25s
emulator (HypervisorConfig)	13m 11s
	5h 49m 49s

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