[PDB] Partial resubmit of r296215, which improved PDB Stream Library.

This was reverted because it was breaking some builds, and
because of incorrect error code usage.  Since the CL was
large and contained many different things, I'm resubmitting
it in pieces.

This portion is NFC, and consists of:

1) Renaming classes to follow a consistent naming convention.
2) Fixing the const-ness of the interface methods.
3) Adding detailed doxygen comments.
4) Fixing a few instances of passing `const BinaryStream& X`.  These
   are now passed as `BinaryStreamRef X`.

llvm-svn: 296394
diff --git a/llvm/unittests/DebugInfo/PDB/StringTableBuilderTest.cpp b/llvm/unittests/DebugInfo/PDB/StringTableBuilderTest.cpp
index 61b88f8..bc54200 100644
--- a/llvm/unittests/DebugInfo/PDB/StringTableBuilderTest.cpp
+++ b/llvm/unittests/DebugInfo/PDB/StringTableBuilderTest.cpp
@@ -33,13 +33,13 @@
   EXPECT_EQ(9U, Builder.insert("baz"));
 
   std::vector<uint8_t> Buffer(Builder.finalize());
-  msf::MutableByteStream OutStream(Buffer);
-  msf::StreamWriter Writer(OutStream);
+  MutableBinaryByteStream OutStream(Buffer);
+  BinaryStreamWriter Writer(OutStream);
   EXPECT_NO_ERROR(Builder.commit(Writer));
 
   // Reads the contents back.
-  msf::ByteStream InStream(Buffer);
-  msf::StreamReader Reader(InStream);
+  BinaryByteStream InStream(Buffer);
+  BinaryStreamReader Reader(InStream);
   StringTable Table;
   EXPECT_NO_ERROR(Table.load(Reader));