NOTE: at this point, we are not committing to another 2.11 release -- this is a placeholder to collect TODOs in case we do decide to cut another release.

Motivation:

• Backport ASM upgrade to fix regression: Update ASM to 6.0 scala#6180
• Fix regression in runner script with unset $JAVA_HOME
• Opportunity for community to help with more targetted backports, in particular ones that help Spark along the lines of Fix for SI-9881 in branch 2.11.x scala#6195
• Backport Fix "cannot be represented as URI" in JDK 13 scala#8210