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/AggressiveAntiDepBreaker.h b/lib/CodeGen/AggressiveAntiDepBreaker.h
index 49be188..6683630 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.h
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.h
@@ -34,7 +34,7 @@
 
   /// Class AggressiveAntiDepState
   /// Contains all the state necessary for anti-dep breaking.
-  class LLVM_LIBRARY_VISIBILITY AggressiveAntiDepState {
+  class AggressiveAntiDepState {
   public:
     /// RegisterReference - Information about a register reference
     /// within a liverange
@@ -114,8 +114,7 @@
 
 
   /// Class AggressiveAntiDepBreaker
-  class LLVM_LIBRARY_VISIBILITY AggressiveAntiDepBreaker
-      : public AntiDepBreaker {
+  class AggressiveAntiDepBreaker : public AntiDepBreaker {
     MachineFunction& MF;
     MachineRegisterInfo &MRI;
     const TargetInstrInfo *TII;