Fix riscv64's crash glue.

When this was translated to riscv64, someone "fixed" the crashing bugs
that were the whole point of these two functions. Fix them back so they
actually crash, and add the CFI directives.

Test: treehugger
Change-Id: I312c51fa4c893d27b0f4e39383521657a5870a0d
1 file changed