Commits on Sep 26, 2016

1. SD-233 synchronized blocks are JIT-friendly again …

   GenBCode, the new backend in Scala 2.12, subtly changed
   the way that synchronized blocks are emitted.
   
   It used `java/lang/Throwable` as an explicitly named exception
   type, rather than implying the same by omitting this in bytecode.
   
   This appears to confuse HotSpot JIT, which reports a error
   parsing the bytecode into its IR which leaves the enclosing method
   stuck in interpreted mode.
   
   This commit passes a `null` descriptor to restore the old pattern
   (the same one used by javac.) I've checked that the JIT warnings
   are gone and that the method can be compiled again.

   

   retronym committed Sep 26, 2016
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