always try to fold a builtin before emitting it.  In the future it is possible that a builtin could sometimes be folded (e.g. __builtin_clz) if it's operand is a constant.
always try to fold a builtin before emitting it.  In the future
it is possible that a builtin could sometimes be folded (e.g. __builtin_clz)
if it's operand is a constant.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@57161 91177308-0d34-0410-b5e6-96231b3b80d8

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