[fp] Support >1 floating point issue width

Add asserts to catch specld wakeups to x0

[rc] Fixes for July RC

[ifu] Disallow aliasing in Icache, there's a bug here

[chisel3] Add IO wrapper.

Merge pull request riscv-boom#29 from ucb-bar/devel

BOOMv2 update.

[bpd] Fix broken SRAM transform utility.