Fix more stack smashing bugs in test.

test/cctest/compiler/test-simplified-lowering.cc

Index: test/cctest/compiler/test-simplified-lowering.cc
diff --git a/test/cctest/compiler/test-simplified-lowering.cc b/test/cctest/compiler/test-simplified-lowering.cc
index 19826a0062c69d3d2aaca14394d3d6c55e1a39ec..9f8990529635352a1704b66124ca558f161860c9 100644
--- a/test/cctest/compiler/test-simplified-lowering.cc
+++ b/test/cctest/compiler/test-simplified-lowering.cc
@@ -372,7 +372,7 @@ TEST(RunLoadElementFromUntaggedBase) {
                  Smi::FromInt(4), Smi::FromInt(5)};
 
   for (size_t i = 0; i < ARRAY_SIZE(smis); i++) {    // for header sizes
-    for (size_t j = i; j < ARRAY_SIZE(smis); j++) {  // for element index
+    for (size_t j = 0; (i + j) < ARRAY_SIZE(smis); j++) {  // for element index
       int offset = static_cast<int>(i * sizeof(Smi*));
       ElementAccess access = {kUntaggedBase, offset, Type::Integral32(),
                               kMachineTagged};
@@ -400,7 +400,7 @@ TEST(RunStoreElementFromUntaggedBase) {
                  Smi::FromInt(4), Smi::FromInt(5)};
 
   for (size_t i = 0; i < ARRAY_SIZE(smis); i++) {    // for header sizes
-    for (size_t j = i; j < ARRAY_SIZE(smis); j++) {  // for element index
+    for (size_t j = 0; (i + j) < ARRAY_SIZE(smis); j++) {  // for element index
       int offset = static_cast<int>(i * sizeof(Smi*));
       ElementAccess access = {kUntaggedBase, offset, Type::Integral32(),
                               kMachineTagged};