Add -O switch and add SLPVectorizer/BasicAliasAnalysis under it.
Change pass order to more closely match Clang's.
Add patch to LLVM 3.3 with enhancements for vectorizing tuples.
The patch contains functionality and tests backported from
SLPVectorizer changes added to LLVM 3.5.0.
Merge pull request #6271 from ArchRobison/adr/slpvector

Enable SLPVectorizer and make it work for tuples
juliatypes.jl: might finally work
juliatypes.jl: limit Union to two components

This will be easier to implement at a low level, plus allows using bit
vectors to represent the search state. Never use a data structure where
an integer will do.
Hack to handle uninitialized stdio.