Debug API does not work in JIT mode

[dibyendumajumdar]

The main issue is that the 'savedpc' in the call frame is not updated in JIT code. Updating this on every bytecode instruction would inhibit optimization. However one potential solution is to update it when one of following happens:
a) OP_CALL or OP_TAILCALL is invoked
b) A metamethod is invoked
c) Apart from above we also need to handle hooks. Since this is a large overhead (function call) we need to only enable this conditionally

Event	Implementation Status
OP_CALL	Done
OP_TAILCALL	Done
OP_TFORPREP	Done
__add	Done
__sub	Done
__mul	Done
__div	Done
__mod	Done
__pow	Done
__unm	Done
__idiv	Done
__band	Not JITed
__bor	Not JITed
__bxor	Not JITed
__bnot	Not JITed
__shl	Done
__shr	Done
__concat	Done
__len	Done
__eq	Done
__lt	Done
__le	Done
__index	Done
__newindex	Done
__call	Done
Hook	Done

[dibyendumajumdar]

Implemented a dual strategy.
For calls the JIT code generation sets savedpc.
For line hooks, a flag needs to be set - which will then result in setting savedpc and a call to luaG_traceexec() but this is done in a function (ravi_debug_trace in lvm.c) rather than inline to avoid the JIT code bloat that would result if this was inline call at every bytecode instruction.

[dibyendumajumdar]

The Lua C api function lua_setupvalue() modified to perform type checks when types are known. This relies upon the type bing available in the photo up values array.

[dibyendumajumdar]

Fixed in 0.10 and 0.11