[polly][vectorizer] do not emit bitcast i32** to <1 x i32*>*

[Sebastian Pop]

Hi,

I would like to commit a patch from Zino solving several ICEs when compiling the
nightly testsuite with polly's vector backend: -mllvm -polly-vectorizer=polly
Tested on the nightly.

The ICE looks like this:
lib/IR/Instructions.cpp:2929: llvm::BitCastInst::BitCastInst(llvm::Value *, llvm::Type *, const llvm::Twine &, llvm::Instruction *): Assertion `castIsValid(getOpcode(), S, Ty) && "Illegal BitCast"' failed.

The ICE appears very often during the compilation of the nightly testsuite (with CPU2000 and CPU2006):
$ cat llvm-master-3706eda-clang-master-d815b3a-polly-master-b99acd7/runme.testsuite.2013_09_24_16_51_27.log | grep "Illegal BitCast" | wc -l
34

The attached patch fixes all these ICEs.  Ok to commit?

Also attached are two patches that make the testsuite pass with ISL codegen.
Ok to commit?

Thanks,
Sebastian
-- 
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