Reapply "[IR] Move optional data in llvm::Function into a hungoff uselist"

Make personality functions, prefix data, and prologue data hungoff
operands of Function.

This is based on the email thread "[RFC] Clean up the way we store
optional Function data" on llvm-dev.

Thanks to sanjoyd, majnemer, rnk, loladiro, and dexonsmith for feedback!

Includes a fix to scrub value subclass data in dropAllReferences.

Differential Revision: http://reviews.llvm.org/D13829

llvm-svn: 256093

1 files changed, 0 insertions, 11 deletions

diff --git a/llvm/lib/IR/LLVMContextImpl.h b/llvm/lib/IR/LLVMContextImpl.h
index ae987e65bcb..a24114d0a0a 100644
--- a/llvm/lib/IR/LLVMContextImpl.h
+++ b/llvm/lib/IR/LLVMContextImpl.h
@@ -1014,17 +1014,6 @@ public:
   /// instructions in different blocks at the same location.
   DenseMap<std::pair<const char *, unsigned>, unsigned> DiscriminatorTable;
 
-  typedef DenseMap<const Function *, ReturnInst *> FunctionDataMapTy;
-
-  /// \brief Mapping from a function to its prefix data, which is stored as the
-  /// operand of an unparented ReturnInst so that the prefix data has a Use.
-  FunctionDataMapTy PrefixDataMap;
-
-  /// \brief Mapping from a function to its prologue data, which is stored as
-  /// the operand of an unparented ReturnInst so that the prologue data has a
-  /// Use.
-  FunctionDataMapTy PrologueDataMap;
-
   int getOrAddScopeRecordIdxEntry(MDNode *N, int ExistingIdx);
   int getOrAddScopeInlinedAtIdxEntry(MDNode *Scope, MDNode *IA,int ExistingIdx);