Added a function scalarizePHI() that sclarizes a vector phi instruction if it has only 2 uses: one to promote the vector phi in a loop and the other use is an extract operation of one element at a constant location.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179783 91177308-0d34-0410-b5e6-96231b3b80d8
C API: Fix coding style

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179785 91177308-0d34-0410-b5e6-96231b3b80d8
In the function InstCombiner::visitExtractElementInst() removed the limitation that extract is promoted over a cast only if the cast has only one use.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179786 91177308-0d34-0410-b5e6-96231b3b80d8