Commits on Dec 11, 2013

1. Disable all unwinding on -Z no-landing-pads LTO …

   When performing LTO, the rust compiler has an opportunity to completely strip
   all landing pads in all dependent libraries. I've modified the LTO pass to
   recognize the -Z no-landing-pads option when also running an LTO pass to flag
   everything in LLVM as nothrow. I've verified that this prevents any and all
   invoke instructions from being emitted.
   
   I believe that this is one of our best options for moving forward with
   accomodating use-cases where unwinding doesn't really make sense. This will
   allow libraries to be built with landing pads by default but allow usage of them
   in contexts where landing pads aren't necessary.
   
   cc rust-lang#10780

   

   alexcrichton committed Dec 11, 2013
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