8202842: G1 footprint regressions in jdk11+10
Summary: Lazily initialize G1FromCardCache to save on startup footprint if AlwaysPretouch is disabled.
Reviewed-by: sjohanss, redestad
^build/
^dist/
^.idea/
nbproject/private/
^webrev
^.src-rev$
^.jib/
\.DS_Store
\.metadata/
\.recommenders/
test/nashorn/script/external
test/nashorn/lib
NashornProfile.txt
.*/JTreport/.*
.*/JTwork/.*
.*/.git/.*