Shenandoah should not uncommit below minimum heap size

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        There is some confusion what -Xms really means. Current code assumes it only means "initial" heap size, which allows it to uncommit the heap below -Xms. However, users expect -Xms to mean "minimum heap size" to set the low watermark for heap shrinkage. We need to amend Shenandoah to avoid uncommitting below that watermark.

          1.
          		 Release Note: Shenandoah Changes -Xms to Mean "minimum heap size" Sub-task Closed Aleksey Shipilev  

              Assignee:
              Aleksey Shipilev
              Reporter:
              Aleksey Shipilev
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