[turbofan] Add bounds check to Node::InputAt(index) and fix tests that go out of bounds.

test/cctest/compiler/test-osr.cc

Index: test/cctest/compiler/test-osr.cc
diff --git a/test/cctest/compiler/test-osr.cc b/test/cctest/compiler/test-osr.cc
index d2171188f844e79984625c1d8dac9bfb3f24f709..8c37802be9ecc5911dc5f7af89cf0eec057c2b4e 100644
--- a/test/cctest/compiler/test-osr.cc
+++ b/test/cctest/compiler/test-osr.cc
@@ -523,8 +523,8 @@ TEST(Deconstruct_osr_nested3) {
   // middle loop.
   Node* loop1 = T.graph.NewNode(T.common.Loop(2), loop0.if_true, T.self);
   loop1->ReplaceInput(0, loop0.if_true);
-  Node* loop1_phi =
-      T.graph.NewNode(T.common.Phi(kMachAnyTagged, 2), loop0_cntr, loop0_cntr);
+  Node* loop1_phi = T.graph.NewNode(T.common.Phi(kMachAnyTagged, 2), loop0_cntr,
+                                    loop0_cntr, loop1);
 
   // innermost (OSR) loop.
   While loop2(T, T.p0, true, 1);