[turbofan] Length and index2 are unsigned in CheckedLoad/CheckedStore.

src/compiler/code-generator-impl.h

Index: src/compiler/code-generator-impl.h
diff --git a/src/compiler/code-generator-impl.h b/src/compiler/code-generator-impl.h
index 747c65e818f528a034f5e2449ec90fb5591abc27..adb840069cc9f369637acc58c502af5f25446092 100644
--- a/src/compiler/code-generator-impl.h
+++ b/src/compiler/code-generator-impl.h
@@ -43,6 +43,10 @@ class InstructionOperandConverter {
     return ToConstant(instr_->InputAt(index)).ToInt32();
   }
 
+  uint32_t InputUint32(size_t index) {
+    return bit_cast<uint32_t>(InputInt32(index));
+  }
+
   int64_t InputInt64(size_t index) {
     return ToConstant(instr_->InputAt(index)).ToInt64();
   }