[PATCH] Document the CoreCLR GC Strategy

[Philip Reames]

LGTM


================
Comment at: docs/GarbageCollection.rst:531
@@ +530,3 @@
+Support for this GC strategy is a work in progress. This strategy will
+differ from
+:ref:`statepoint-example GC<statepoint_example_gc>` strategy in
----------------
work in progress (as of May 2015)

http://reviews.llvm.org/D9895

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