RFR: Adding troubleshooting section to README.md [v2]

[Adam Sotona]

On Mon, 25 Jan 2021 10:58:52 GMT, Adam Sotona <asotona at openjdk.org> wrote:

>> README.md line 60:
>> 
>>> 58: It is caused by recently enabled Jigsaw enforcement and micros-javac benchmarks requirement to access several jdk.compiler module private packages. 
>>> 59: 
>>> 60: Solution is to export required packages by adding following options to the command line:
>> 
>> assuming this issue comes from reflective access, what about adding a single option to permit illegal access?
>
> I thought it was also removed however it is only  deprecated, so to generally permit illegal access is definitely better solution. Thanks!

fixed

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PR: https://git.openjdk.java.net/jmh-jdk-microbenchmarks/pull/5