Revert "[Sema] Diagnose default-initialization, destruction, and copying of"

This reverts commit r365985.

Prior to r365985, clang used to mark C union fields that have
non-trivial ObjC ownership qualifiers as unavailable if the union was
declared in a system header. r365985 stopped doing so, which caused the
swift compiler to crash when it tried to import a non-trivial union.

I have a patch that fixes the crash (https://reviews.llvm.org/D65256),
but I'm temporarily reverting the original patch until we can decide on
whether it's taking the right approach.

llvm-svn: 367076

1 files changed, 0 insertions, 3 deletions

diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 3cac82ad421..b40e3cf8926 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -794,9 +794,6 @@ ASTDeclReader::VisitRecordDeclImpl(RecordDecl *RD) {
   RD->setNonTrivialToPrimitiveDefaultInitialize(Record.readInt());
   RD->setNonTrivialToPrimitiveCopy(Record.readInt());
   RD->setNonTrivialToPrimitiveDestroy(Record.readInt());
-  RD->setHasNonTrivialToPrimitiveDefaultInitializeCUnion(Record.readInt());
-  RD->setHasNonTrivialToPrimitiveDestructCUnion(Record.readInt());
-  RD->setHasNonTrivialToPrimitiveCopyCUnion(Record.readInt());
   RD->setParamDestroyedInCallee(Record.readInt());
   RD->setArgPassingRestrictions((RecordDecl::ArgPassingKind)Record.readInt());
   return Redecl;