Use getPrimitiveSizeInBits() instead of getPrimitiveSize()*8
Use getPrimitiveSizeInBits() instead of getPrimitiveSize()*8

Completely rework the 'setcc (cast x to larger), y' code.  This code has
the advantage of implementing setcc.ll:test19 (being more general than
the previous code) and being correct in all cases.

This allows us to unxfail 2004-11-27-SetCCForCastLargerAndConstant.ll,
and close PR454.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@21491 91177308-0d34-0410-b5e6-96231b3b80d8

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