Update GEP constructors to use an iterator interface to fix
GLIBCXX_DEBUG issues.

llvm-svn: 41697
diff --git a/llvm/lib/Transforms/Scalar/GVNPRE.cpp b/llvm/lib/Transforms/Scalar/GVNPRE.cpp
index e56be31..d362f54 100644
--- a/llvm/lib/Transforms/Scalar/GVNPRE.cpp
+++ b/llvm/lib/Transforms/Scalar/GVNPRE.cpp
@@ -945,7 +945,7 @@
     
     if (newOp1 != U->getPointerOperand() || changed_idx) {
       Instruction* newVal = new GetElementPtrInst(newOp1,
-                                       &newIdx[0], newIdx.size(),
+                                       newIdx.begin(), newIdx.end(),
                                        U->getName()+".expr");
       
       uint32_t v = VN.lookup_or_add(newVal);
@@ -1675,7 +1675,7 @@
                                   C->getName()+".gvnpre", 
                                   (*PI)->getTerminator());
       else if (GetElementPtrInst* G = dyn_cast<GetElementPtrInst>(U))
-        newVal = new GetElementPtrInst(s1, &sVarargs[0], sVarargs.size(), 
+        newVal = new GetElementPtrInst(s1, sVarargs.begin(), sVarargs.end(), 
                                        G->getName()+".gvnpre", 
                                        (*PI)->getTerminator());