patch for PR9027 and // rdar://11861085

Title: [PR9027] volatile struct bug: member is not loaded at -O;
This is caused by last flag passed to @llvm.memcpy being false, 
not honoring that aggregate has at least one 'volatile' data member 
(even though aggregate itself has not been qualified as 'volatile'. 
As a result, optimization optimizes away the memcpy altogether.
Patch review by John MaCall (I still need to fix up a test though).


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173535 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/include/clang/AST/Decl.h b/include/clang/AST/Decl.h
index 8b9688baea..cfcbeb2c00 100644
--- a/include/clang/AST/Decl.h
+++ b/include/clang/AST/Decl.h
@@ -2930,6 +2930,10 @@ class RecordDecl : public TagDecl {
   /// HasObjectMember - This is true if this struct has at least one member
   /// containing an Objective-C object pointer type.
   bool HasObjectMember : 1;
+  
+  /// HasVolatileMember - This is true if struct has at least one member of
+  /// 'volatile' type.
+  bool HasVolatileMember : 1;
 
   /// \brief Whether the field declarations of this record have been loaded
   /// from external storage. To avoid unnecessary deserialization of
@@ -2986,6 +2990,9 @@ public:
   bool hasObjectMember() const { return HasObjectMember; }
   void setHasObjectMember (bool val) { HasObjectMember = val; }
 
+  bool hasVolatileMember() const { return HasVolatileMember; }
+  void setHasVolatileMember (bool val) { HasVolatileMember = val; }
+  
   /// \brief Determines whether this declaration represents the
   /// injected class name.
   ///