Replace silly uses of 'signed' with 'int'

llvm-svn: 273244
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
index 9e97d7b..e23b70a 100644
--- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -1398,7 +1398,7 @@
     if (Op1 == &GEP)
       return nullptr;
 
-    signed DI = -1;
+    int DI = -1;
 
     for (auto I = PN->op_begin()+1, E = PN->op_end(); I !=E; ++I) {
       GetElementPtrInst *Op2 = dyn_cast<GetElementPtrInst>(*I);