[Float2Int] Don't operate on vector instructions

This fixes a crash bug. It's also not clear if we'd want to do this
transform for vectors.

llvm-svn: 255155
diff --git a/llvm/lib/Transforms/Scalar/Float2Int.cpp b/llvm/lib/Transforms/Scalar/Float2Int.cpp
index a9a4a24..7f5d786 100644
--- a/llvm/lib/Transforms/Scalar/Float2Int.cpp
+++ b/llvm/lib/Transforms/Scalar/Float2Int.cpp
@@ -131,6 +131,8 @@
 // integer domain.
 void Float2Int::findRoots(Function &F, SmallPtrSet<Instruction*,8> &Roots) {
   for (auto &I : instructions(F)) {
+    if (isa<VectorType>(I.getType()))
+      continue;
     switch (I.getOpcode()) {
     default: break;
     case Instruction::FPToUI: