[CodeView] Isolate Debug Info Fragments into standalone classes.

Previously parsing of these were all grouped together into a
single master class that could parse any type of debug info
fragment.

With writing forthcoming, the complexity of each individual
fragment is enough to warrant them having their own classes so
that reading and writing of each fragment type can be grouped
together, but isolated from the code for reading and writing
other fragment types.

In doing so, I found a place where parsing code was duplicated
for the FileChecksums fragment, across llvm-readobj and the
CodeView library, and one of the implementations had a bug.
Now that the codepaths are merged, the bug is resolved.

Differential Revision: https://reviews.llvm.org/D32547

llvm-svn: 301557
diff --git a/llvm/lib/DebugInfo/CodeView/CMakeLists.txt b/llvm/lib/DebugInfo/CodeView/CMakeLists.txt
index 5dae51e..7655f6c 100644
--- a/llvm/lib/DebugInfo/CodeView/CMakeLists.txt
+++ b/llvm/lib/DebugInfo/CodeView/CMakeLists.txt
@@ -7,8 +7,12 @@
   EnumTables.cpp
   Formatters.cpp
   Line.cpp
+  ModuleDebugFileChecksumFragment.cpp
   ModuleDebugFragment.cpp
+  ModuleDebugFragmentRecord.cpp
   ModuleDebugFragmentVisitor.cpp
+  ModuleDebugLineFragment.cpp
+  ModuleDebugUnknownFragment.cpp
   RecordSerialization.cpp
   SymbolRecordMapping.cpp
   SymbolDumper.cpp