Chris Lattner d9083d2e50 rework SGF::emitOptionalToOptional to keep loadable SILValue's as ...

registers instead of eagerly dumping them in memory and operating on
them by-address.  This avoids a lot of temporaries and traffic to 
manipulate them.

As part of this, add some new SGF::getOptionalNoneValue/getOptionalSomeValue
helper methods for forming loading optional values.

Many thanks to JoeG for helping with the abstraction difference change in
getOptionalSomeValue.



Swift SVN r27537

2015-04-21 22:54:08 +00:00

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