* GC.start, not ObjectSpace.start.
* Time.time_s_from_array does not exist on Rubinius.

…ler.

* The semantics are better reflected with that name.

* And visibility checking for private with an explicit receiver is always false.

…rk - workaround.

… to only be instr 0 of the linearized instr list used only by the interpreter. It removes all remaining IRScope state knowledge from interpreter (not currently hooked up).

…ich may replace parent variables with temp vars. We cannot use this simpler approach and will end up going the original full-clone route. Commented out cloning in prepareInstructions

* Such as self.foo=bar and self[foo]=bar

* Fixes some rubyspec failures when this is enabled.

…erContext

…ken.

* Lambdas need to trap breaks/nonlocal-returns and terminate them.
  However, whether a block becomes a lambda or not is determined
  at runtime. So, only blocks that becomes lambdas need a try/catch
  to trap these breaks/nonlocal-returns. So far, in the interp,
  we used to tackle these by adding the try/catch at runtime on
  first execution.

* This patch eliminates that runtime check and unconditionally
  adds the try/catch for all blocks (lambdas or not). Did this by
  uncommenting the unconditional handling that was there in
  IRBuilder.

  To make sure everything continued to work fine, fixed non-local
  return handling in IRReturnHelpers to ignore them if the
  blockType is not null (methods) or a lambda. This ensures
  that independent of what exists on the scope-stack, we only test
  for a matching non-local returns in lambdas or method scopes.

* Had to fix up addition of global-ensure-blocks in store-local-var
  analysis to only add a GEB if one didn't already exist.

* Eliminated all lambda-specific tests while preparing instructions
  for interpretation/JITting.

* Unrelated:
  - Fixed toStringOutput of BacktickInstr

…execute.

This should eliminate nearly all contention between JIT and intepreter.  There is still
one remaining bug involving label operands cloning when we don't want them to so
instr cloning (last bit) is disabled atm.