Teach DeclContext deserialization to pay attention to endianness, from
David Fang and Takumi Nakamura. Fixes many PCH failures on PowerPC.

llvm-svn: 147657
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index a7d143b..2864fcf 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -747,7 +747,7 @@
                                       unsigned DataLen) {
   using namespace clang::io;
   unsigned NumDecls = ReadUnalignedLE16(d);
-  DeclID *Start = (DeclID *)d;
+  LE32DeclID *Start = (LE32DeclID *)d;
   return std::make_pair(Start, Start + NumDecls);
 }