ARM: Add tailcall instructions.
ARM: Add missing metamethod handlers and continuations.
ARM: Add BC_CAT and lj_cont_cat.
ARM: Misc. fixes for interpreter.
ARM: Add GPR variants for shift aliases to DynASM.
ARM: Add bit.* fast functions and lj_vm_tobit().
Use lj_vm_tobit() on targets without FPU.
ARM: Add rawget() fast function.
ARM: Add string.* fast functions and GC steps.
ARM: Misc. fixes for interpreter.
PPC: Misc. fixes for interpreter.
Fix recording of JLOOP with higher maxslot.
Inline lj_gc_barrierback().
Avoid phantom stores to proxy tables.
Optimize lookups in empty proxy tables.
Add support for tailcalls from internal C functions.

PPC: Fix __call metamethod for tailcalls.
FFI: Add ctype metamethods and ffi.metatype().
ARM: Add modulo subroutine and temp. math.floor()/math.ceil().
ARM: Add dispatch targets for hooks.
ARM: Add BC_VARG and BC_TSETM.