* jalr-01 uses 'la x0' which is rejected as invalid by recent binutils
* cebreak-01 miscompares due to hardwired mtval (common upstream test issue)
Correct fix is blocked on bringing up the latest riscv-arch-test build
system for hazard3 (seems to have been completely rewritten again)
framework -- scripts are a little janky for now.
Note there is one test failure (cebreak-01) -- analysis shows
this is due to the reference vector expecting mtval to be set
informatively, whereas our implementation (legally) ties it
to zero. Non-mtval-related signature for that test is correct
so I'm saying this is fine.
Luke Wren