Make getCompileUnitForAddress public.

[saugustine]

Summary

Certain dwarf information (like the compilation directory), are only
accessible from the compile unit. Make it available for use.

[echristo]

Sure. LGTM.

llvm/include/llvm/DebugInfo/DWARF/DWARFContext.h

public:
   /// Get address size from CUs.
   /// TODO: refactor compile_units() to make this const.
   uint8_t getCUAddrSize();
 
   Triple::ArchType getArch() const {
     return getDWARFObj().getFile()->getArch();
   }
 
-private:
-  /// Parse a macro[.dwo] or macinfo[.dwo] section.
-  std::unique_ptr<DWARFDebugMacro>
-  parseMacroOrMacinfo(MacroSecType SectionType);
-
   /// Return the compile unit which contains instruction with provided
   /// address.
   /// TODO: change input parameter from "uint64_t Address"
   ///       into "SectionedAddress Address"
   DWARFCompileUnit *getCompileUnitForAddress(uint64_t Address);
+
+private:
+  /// Parse a macro[.dwo] or macinfo[.dwo] section.
+  std::unique_ptr<DWARFDebugMacro>
+  parseMacroOrMacinfo(MacroSecType SectionType);
+
   void addLocalsForDie(DWARFCompileUnit *CU, DWARFDie Subprogram, DWARFDie Die,
                        std::vector<DILocal> &Result);
 };
 
 } // end namespace llvm
 
 #endif // LLVM_DEBUGINFO_DWARF_DWARFCONTEXT_H