[PATCH] Prevent binary-tree deterioration in sparse trees.

[Hans Wennborg]

Still lgtm.


================
Comment at: lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp:2434
@@ -2432,2 +2433,3 @@
     volatile double LDensity =
-        LSize.roundToDouble() / (LEnd - First + 1ULL).roundToDouble();
+        LSize.ult(TLI.getMinimumJumpTableEntries())
+            ? 0.0
----------------
Maybe add a comment about why we're doing this check?

http://reviews.llvm.org/D7070

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