Patch 876451: restores performance of [return]. Also allows forms

        such as [return -code error $msg] to be bytecompiled.

        * generic/tclInt.h:     Factored Tcl_ReturnObjCmd() into two pieces:
        * generic/tclCmdMZ.c:   TclMergeReturnOptions(), which can parse the
        options to [return], check their validity, and create the
        corresponding return options dictionary, and TclProcessReturn(),
        which takes that return options dictionary and performs the
        [return] operation.

        * generic/tclCompCmds.c:        Rewrote TclCompileReturnCmd() to
        call TclMergeReturnOptions() at compile time so the return options
        dictionary is computed at compile time (when it is fully known).
        The dictionary is pushed on the stack along with the result, and
        the code and level values are included in the bytecode as operands.
        Also supports optimized compilation of un-[catch]ed [return]s from
        procs with default options into the INST_DONE instruction.

        * generic/tclExecute.c: Rewrote INST_RETURN instruction to retrieve
        the code and level operands, pop the return options from the stack,
        and call TclProcessReturn() to perform the [return] operation.

        * generic/tclCompile.h: New utilities include TclEmitInt4 macro
        * generic/tclCompile.c: and TclWordKnownAtCompileTime().

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