There are some uses of 0 as a null pointer constant in x86 code that can be fixed by just using nullptr instead. 
            
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                    JDK-8332189 Enable -Wzero-as-null-pointer-constant for gcc -           
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        openjdk/jdk/431d4f7e Commit(master)
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        openjdk/jdk/20453 Review(master)
        openjdk/jdk/20453