Add cortex-m arm-support for s2e#13

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weizhou-chaojixx wants to merge 8 commits intoS2E:v3.0.0-sefrom

weizhou-chaojixx:arm-support1

Commits on Oct 16, 2019

feat: add support for compiling ARM KVM mode on X86
weizhou-chaojixx
committed

Commits on Nov 16, 2019

feat:add cortex-m kvm vcpu init
weizhou-chaojixx
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feat: add armv7m_space_memory for sync cortex-m SCS memory region
weizhou-chaojixx
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refactor: separate necessary nvic interfaces which also used for cortex-m cpu interrupt
weizhou-chaojixx
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feat:sync sregs when cpu exit due to KVM_EXIT_SYNC_ARM_V7M_SREGS
weizhou-chaojixx
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add roms/vgabios/ for .gitignore
weizhou-chaojixx
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kvm: add api to register fixed memory regions for armv7m
weizhou-chaojixx
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arm kvm: add cortex-m get regs for original one
weizhou-chaojixx
committed