[PECOFF] Support a new type of weak symbol.

Summary:
COMDAT_SELECT_SAME_SIZE is a COMDAT type that I presume exist only in COFF.
The semantics of the type is that linker should merge such COMDAT sections if
their sizes are the same. Otherwise it's an error.

Reviewers: Bigcheese, shankarke, kledzik

CC: llvm-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2996

llvm-svn: 203308

1 files changed, 3 insertions, 1 deletions

diff --git a/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp b/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
index 30ede7698a9..03a22447734 100644
--- a/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
+++ b/lld/lib/ReaderWriter/YAML/ReaderWriterYAML.cpp
@@ -337,7 +337,9 @@ template <> struct ScalarEnumerationTraits<lld::DefinedAtom::Merge> {
     io.enumCase(value, "as-weak",      lld::DefinedAtom::mergeAsWeak);
     io.enumCase(value, "as-addressed-weak",
                                    lld::DefinedAtom::mergeAsWeakAndAddressUsed);
-    io.enumCase(value, "by-content",  lld::DefinedAtom::mergeByContent);
+    io.enumCase(value, "by-content",   lld::DefinedAtom::mergeByContent);
+    io.enumCase(value, "same-name-and-size",
+                lld::DefinedAtom::mergeSameNameAndSize);
   }
 };