[PATCH] gold, libLTO: Add new flags to support bit set lowering.

[Rafael Ávila de Espíndola]

================
Comment at: lib/Transforms/IPO/PassManagerBuilder.cpp:530
@@ +529,3 @@
+    // Clean up after the bit set lowering pass.
+    PM.add(createCFGSimplificationPass());
+
----------------
Should these still be enabled at -O0?

================
Comment at: tools/gold/gold-plugin.cpp:98
@@ -97,1 +97,3 @@
   static std::string mcpu;
+  static bool disable_opt = false;
+  static bool lowerbitsets = false;
----------------
DisableOpt.
LowerBitSets.

http://reviews.llvm.org/D8401

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