8224529: [TESTBUG] JFR TestShenandoahHeapRegion* tests fail on build w/o Shenandoah
Summary: Fixed at-requires statement, updated TEST.ROOT
Reviewed-by: clanger, egahlin
/build/
/dist/
/.idea/
nbproject/private/
/webrev
/.src-rev
/.jib/
.DS_Store
.metadata/
.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
**/JTreport/**
**/JTwork/**