Support vector casts in more places, fixing a variety of assertion

failures.

To support this, add some utility functions to Type to help support
vector/scalar-independent code. Change ConstantInt::get and
ConstantFP::get to support vector types, and add an overload to
ConstantInt::get that uses a static IntegerType type, for
convenience.

Introduce a new getConstant method for ScalarEvolution, to simplify
common use cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73431 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ScalarEvolutionExpander.cpp

@@ -298,9 +298,7 @@ Value *SCEVExpander::expandAddToGEP(const SCEVHandle *op_begin,
               GepIndices.push_back(ConstantInt::get(Type::Int32Ty, ElIdx));
               ElTy = STy->getTypeAtIndex(ElIdx);
               Ops[0] =
-                SE.getConstant(ConstantInt::get(Ty,
-                                                FullOffset -
-                                                  SL.getElementOffset(ElIdx)));
+                SE.getConstant(Ty, FullOffset - SL.getElementOffset(ElIdx));
               AnyNonZeroIndices = true;
               continue;
             }