[PATCH] D40383: Add RISCV privileged instructions

[David Craven via llvm-commits]

> Is there any reason not to include the ecall/ebreak instruction definitions in this patch? (My apologies - I should have directly asked this when commenting on the fact that ecall/ebreak tests were present but not the definitions).

Aren't the ecall and ebreak instructions identical to the ones defined
in the user level specification?