Global variables don't have a corresponding llvm.dbg.declare, yet it is possible

to obtain debug info about them.
Introduce helpers to access debug info for global variables. Also introduce a
helper that works for both local and global variables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66541 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Analysis/DebugInfo.h

@@ -507,6 +507,12 @@ namespace llvm {
   /// Finds the dbg.declare intrinsic corresponding to this value if any.
   /// It looks through pointer casts too.
   const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts = true);
+
+  /// Find the debug info descriptor corresponding to this global variable.
+  Value *findDbgGlobalDeclare(GlobalVariable *V);
+
+  bool getLocationInfo(const Value *V, std::string &DisplayName, std::string &Type, 
+                       unsigned &LineNo, std::string &File, std::string &Dir); 
 } // end namespace llvm
 
 #endif