CTW: C1 compilation bails with "block join failed" due to a complicated jsr/ret structure

It is unclear if this bailout is expected, or the evidence of C1 bug.

$ cd test/hotspot/jtreg/testlibrary/ctw
$ make
$ cd dist
$ wget https://repo1.maven.org/maven2/org/sonatype/appbooter/plexus-platforms/plexus-platform-jsw/2.1.1/plexus-platform-jsw-2.1.1.jar
$ JAVA_OPTIONS="-XX:+AbortVMOnCompilationFailure" ./ctw.sh plexus-platform-jsw-2.1.1.jar

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/compileBroker.cpp:2009
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/shade/trunks/jdk-jdk/src/hotspot/share/compiler/compileBroker.cpp:2009), pid=16090, tid=16120
# fatal error: Not compilable at tier 1: block join failed