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/Bitcode/Reader/BitcodeReader.h b/lib/Bitcode/Reader/BitcodeReader.h
index f82f03f..b095447 100644
--- a/lib/Bitcode/Reader/BitcodeReader.h
+++ b/lib/Bitcode/Reader/BitcodeReader.h
@@ -32,7 +32,7 @@
 //                          BitcodeReaderValueList Class
 //===----------------------------------------------------------------------===//
 
-class LLVM_LIBRARY_VISIBILITY BitcodeReaderValueList {
+class BitcodeReaderValueList {
   std::vector<WeakVH> ValuePtrs;
 
   /// ResolveConstants - As we resolve forward-referenced constants, we add
@@ -91,7 +91,7 @@
 //                          BitcodeReaderMDValueList Class
 //===----------------------------------------------------------------------===//
 
-class LLVM_LIBRARY_VISIBILITY BitcodeReaderMDValueList {
+class BitcodeReaderMDValueList {
   std::vector<WeakVH> MDValuePtrs;
 
   LLVMContext &Context;
@@ -121,7 +121,7 @@
   void AssignValue(Value *V, unsigned Idx);
 };
 
-class LLVM_LIBRARY_VISIBILITY BitcodeReader : public GVMaterializer {
+class BitcodeReader : public GVMaterializer {
   LLVMContext &Context;
   Module *TheModule;
   MemoryBuffer *Buffer;
diff --git a/lib/Bitcode/Writer/ValueEnumerator.h b/lib/Bitcode/Writer/ValueEnumerator.h
index f208eb3..d1ca15f 100644
--- a/lib/Bitcode/Writer/ValueEnumerator.h
+++ b/lib/Bitcode/Writer/ValueEnumerator.h
@@ -34,7 +34,7 @@
 class MDSymbolTable;
 class raw_ostream;
 
-class LLVM_LIBRARY_VISIBILITY ValueEnumerator {
+class ValueEnumerator {
 public:
   typedef std::vector<Type*> TypeList;