Revert "Give internal classes hidden visibility."

It works with clang, but GCC has different rules so we can't make all of those
hidden. This reverts commit r190534.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190536 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveRangeCalc.h b/lib/CodeGen/LiveRangeCalc.h
index 7a371c1..69c7f76 100644
--- a/lib/CodeGen/LiveRangeCalc.h
+++ b/lib/CodeGen/LiveRangeCalc.h
@@ -33,7 +33,7 @@
 template <class NodeT> class DomTreeNodeBase;
 typedef DomTreeNodeBase<MachineBasicBlock> MachineDomTreeNode;
 
-class LLVM_LIBRARY_VISIBILITY LiveRangeCalc {
+class LiveRangeCalc {
   const MachineFunction *MF;
   const MachineRegisterInfo *MRI;
   SlotIndexes *Indexes;