String::format benchmark results

[Vicente Romero]

Hi,

Please see below [1] the last performance measure of String::format. We 
have added a column with the results (data) of using Graal on JDK13 
vanilla. To obtain these numbers we have executed the benchmark with 
these VM options:

-XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+TieredCompilation 
-XX:+UseJVMCICompiler -Djvmci.Compiler=graal

Thanks,
Vicente

[1] 
http://cr.openjdk.java.net/~vromero/string_format_benchmark_results/v4/benchmarkResults_intrinsics_string_format_v4.html