Fix: wrong value written in reg_vscause for local interrupts #587

Job	Run time
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	34m 26s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	42m 12s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	35m 32s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	31m 38s
riscv-tests (DefaultConfig)	41m 34s
riscv-tests (DefaultBufferlessConfig)	38m 43s
riscv-tests (DefaultRV32Config)	36m 27s
riscv-tests (TinyConfig)	24m 41s
riscv-tests (DefaultFP16Config)	35m 22s
riscv-arch-test (DefaultRV32Config,32,RV32IMACZicsr_Zifencei)	1s
riscv-arch-test (DefaultConfig,64,RV64IMACZicsr_Zifencei)	1s
riscv-arch-test (BitManipCryptoConfig,64,RV64IZba_Zbb_Zbc_Zbkb_Zbkc_Zbkx_Zbs_Zknd_Zkne_Zknh_Zksed...	1s
riscv-arch-test (BitManipCrypto32Config,32,RV32IZba_Zbb_Zbc_Zbkb_Zbkc_Zbkx_Zbs_Zknd_Zkne_Zknh_Zks...	1s
emulator (DefaultSmallConfig)	24m 12s
emulator (DualBankConfig)	24m 16s
emulator (DualChannelConfig)	31m 6s
emulator (DualChannelDualBankConfig)	26m 59s
emulator (RoccExampleConfig)	34m 14s
emulator (Edge128BitConfig)	24m 27s
emulator (Edge32BitConfig)	24m 35s
emulator (QuadChannelBenchmarkConfig)	26m 50s
emulator (EightChannelConfig)	25m 25s
emulator (DualCoreConfig)	25m 2s
emulator (MemPortOnlyConfig)	24m 17s
emulator (MMIOPortOnlyConfig)	28m 37s
emulator (CloneTileConfig)	31m 32s
emulator (HypervisorConfig)	34m 55s
	11h 47m 6s

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