Add missing `@CanIgnoreReturnValue` annotation to j2cl version of `Hasher`.
package com.google.common.hash;
+import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.nio.charset.Charset;
/** No-op J2CL impl */
public abstract class Hasher {
+ @CanIgnoreReturnValue
public abstract Hasher putInt(int i);
+ @CanIgnoreReturnValue
public abstract Hasher putLong(long x);
+ @CanIgnoreReturnValue
public abstract Hasher putString(CharSequence charSequence, Charset charset);
public abstract HashCode hash();
