Revert "Use the range machinery for DW_AT_ranges and DW_AT_high/lo_pc."

This appears to trigger failures with optimization and function arguments somehow.

This reverts commit r204277.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204286 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -406,13 +406,6 @@ class DwarfDebug : public AsmPrinterHandler {
   // If nonnull, stores the current machine instruction we're processing.
   const MachineInstr *CurMI;
 
-  // If nonnull, stores the section that the previous function was allocated to
-  // emitting.
-  const MCSection *PrevSection;
-
-  // If nonnull, stores the CU in which the previous subprogram was contained.
-  const DwarfCompileUnit *PrevCU;
-
   // Section Symbols: these are assembler temporary labels that are emitted at
   // the beginning of each supported dwarf section.  These are used to form
   // section offsets and are created by EmitSectionLabels.
@@ -748,18 +741,15 @@ public:
   /// split dwarf proposal support.
   bool useSplitDwarf() const { return HasSplitDwarf; }
 
+  /// \brief Returns whether or not to use AT_ranges for compilation units.
+  bool useCURanges() const { return HasCURanges; }
+
   /// Returns the Dwarf Version.
   unsigned getDwarfVersion() const { return DwarfVersion; }
 
   /// Returns the section symbol for the .debug_loc section.
   MCSymbol *getDebugLocSym() const { return DwarfDebugLocSectionSym; }
 
-  /// Returns the previous section that was emitted into.
-  const MCSection *getPrevSection() const { return PrevSection; }
-
-  /// Returns the previous CU that was being updated
-  const DwarfCompileUnit *getPrevCU() const { return PrevCU; }
-
   /// Returns the entries for the .debug_loc section.
   const SmallVectorImpl<DebugLocEntry> &getDebugLocEntries() const {
     return DotDebugLocEntries;