Only correctly lower exception handing intrinsics if exception handling is turned on.  Likewise for scanning of invokes to mark landing pads.
Only correctly lower exception handing intrinsics if exception handling is
turned on.  Likewise for scanning of invokes to mark landing pads.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@37570 91177308-0d34-0410-b5e6-96231b3b80d8

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