8221413: javac does not recognize variable assigned in switch expression as DA Summary: Fixing definite assignment in presence of implicit throws clause in switch expressions over enums. Reviewed-by: vromero

/build/
/dist/
/.idea/
nbproject/private/
/webrev
/.src-rev
/.jib/
.DS_Store
.metadata/
.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
**/JTreport/**
**/JTwork/**