RFC (S) 8076758: new StringBuilder().append(String).toString() should be recognized by OptimizeStringConcat

[Aleksey Shipilev]

Hi,

I would like to see this one fixed, because it touches on pending String
improvements in JDK:
  https://bugs.openjdk.java.net/browse/JDK-8076758

Here is a proof-of-concept patch:
  http://cr.openjdk.java.net/~shade/8076758/webrev.00/

It passes JPRT and fixes the performance issues in microbenchmarks, but
I'm not sure the code change is completely correct, given the history of
OptimizeStringConcat bugs. Could anyone from a compiler team chime in?

Thanks!
-Aleksey

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