6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker Summary: GC-locker induced concurrent full gc should be asynchronous; policy now controlled by a separate flag, which defaults to false. Reviewed-by: jmasa

;
; This .DEF file is a placeholder for one which is automatically
; generated during the build process. See
; make\windows\build_vm_def.sh and
; make\windows\makefiles\makedeps.make (esp. the "-prelink"
; options).
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