vsets should trap when mstatus.VS is off #1042

Job	Run time
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	22m 7s
riscv-arch-test	0s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	19m 56s
emulator (DefaultSmallConfig)	15m 19s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 55s
riscv-tests (DefaultConfig)	20m 5s
emulator (DualBankConfig)	13m 36s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	17m 26s
riscv-tests (DefaultBufferlessConfig)	19m 33s
emulator (DualChannelConfig)	13m 30s
riscv-tests (DefaultRV32Config)	18m 36s
emulator (DualChannelDualBankConfig)	13m 55s
riscv-tests (TinyConfig)	13m 45s
emulator (RoccExampleConfig)	13m 46s
riscv-tests (DefaultFP16Config)	14m 39s
emulator (Edge128BitConfig)	13m 31s
riscv-tests (DefaultBConfig)	14m 2s
emulator (Edge32BitConfig)	13m 40s
riscv-tests (DefaultRV32BConfig)	13m 35s
emulator (QuadChannelBenchmarkConfig)	13m 40s
emulator (EightChannelConfig)	13m 42s
emulator (DualCoreConfig)	14m 4s
emulator (MemPortOnlyConfig)	13m 13s
emulator (MMIOPortOnlyConfig)	15m 20s
emulator (CloneTileConfig)	14m 46s
emulator (HypervisorConfig)	13m 15s
	6h 27m 56s

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