target/riscv/riscv.c: support auto-selection of software breakpoint size #1273
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Add auto-selection of breakpoint size for RISC-V targets. The new length depends on C extension. If the C extension is used, the auto-selected length is 2 bytes. Otherwise, the default length is 4 bytes.
Change-Id: Ie3473514beace15b76714aa6d5441122cd3262aa