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riscv64: fix mips-ism.
r29 is the stack pointer on mips, but it's x2 on riscv64 (and the git history shows that this was indeed copy & pasted from the mips code) and since bionic always sets up a signal stack with sigaltstack() I doubt the comment was relevant even on mips (but no-one ever used it, so who'd know?). While I'm here, stop using decimal arithmetic --- the whole point was to have each register contain the value that was obviously appropriate for that register. (riscv64's mips-like mess of registers all over the place means that's not going to be super readable, but there's no reason to make it worse.) Also, even though I personally prefer the 0xdead from the old mips code, everyone else is using 0xa5a5, so let's make riscv64 match the others. Test: treehugger Change-Id: Ibbae821bc0a02e07164147d621e342224528c2c9