PATCH: interpreter.cc bug patch and performance improvements

[Chris Sears]

Tom,

my last email to you bounced, too many hops.

Attached is an expanded and more documented patch.  I think I've
handled
the SEGV case correctly.

In addition, I've changed the SAVE_PC macro to save pc rather than pc-1
and the exception handler to compute offset by one.

Also, fdiv, frem, ddiv and drem can't cause runtime exceptions, so they
don't need SAVE_PC's.


Chris

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