improvement: Use java.lang.StringBuilder for optimized concatation of Strings in NIR CodeGen
#3640
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Previously always String concatation was using
String.concatwhich was in-optimal when used in String interpolators. One of Scala 2 partests was generating way too large files becouse of that: https://github.com/scala/scala/blob/e09bfc87119d5152c131e0c98757d5b9e48a794b/test/files/run/t11665.scala In case of this file size of generated NIR has dropped from over 1MB leading to BufferOverflowException in serializer, to ~150kb, which shall be similar with the size of generated TASTy for this file.