Upgrade ASM to 6.0, fix bug with very large methods

Adapted from scala/scala#6180 by Lukas Rytz, the
test case demonstrates that scala/bug#10594 is
fixed. The test case is put in tests/run-no-optimise because the
optimiser runs forever on this code.

Author: smarter

project/Build.scala

@@ -435,7 +435,7 @@ object Build {
       }.taskValue,
 
       // Used by the backend
-      libraryDependencies += "org.scala-lang.modules" % "scala-asm" % "5.2.0-scala-2",
+      libraryDependencies += "org.scala-lang.modules" % "scala-asm" % "6.0.0-scala-1",
 
       // set system in/out for repl
       connectInput in run := true,