Revert "unique_ptrify LiveRange::segmentSet"

Apparently something does care about ordering of LiveIntervals... so
revert all that stuff (r231175, r231176, r231177) & take some time to
re-evaluate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231184 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveInterval.h

@@ -199,7 +199,7 @@ namespace llvm {
     // of live ranges of physical registers in computeRegUnitRange.
     // After that the set is flushed to the segment vector and deleted.
     typedef std::set<Segment> SegmentSet;
-    std::unique_ptr<SegmentSet> segmentSet;
+    SegmentSet *segmentSet;
 
     typedef Segments::iterator iterator;
     iterator begin() { return segments.begin(); }
@@ -218,13 +218,15 @@ namespace llvm {
     const_vni_iterator vni_end() const   { return valnos.end(); }
 
     /// Constructs a new LiveRange object.
-    LiveRange(bool UseSegmentSet = false)
-        : segmentSet(UseSegmentSet ? llvm::make_unique<SegmentSet>()
-                                   : nullptr) {}
+    LiveRange(bool UseSegmentSet = false) : segmentSet(nullptr) {
+      if (UseSegmentSet)
+        segmentSet = new SegmentSet();
+    }
 
     /// Constructs a new LiveRange object by copying segments and valnos from
     /// another LiveRange.
-    LiveRange(const LiveRange &Other, BumpPtrAllocator &Allocator) {
+    LiveRange(const LiveRange &Other, BumpPtrAllocator &Allocator)
+        : segmentSet(nullptr) {
       assert(Other.segmentSet == nullptr &&
              "Copying of LiveRanges with active SegmentSets is not supported");
 
@@ -238,6 +240,8 @@ namespace llvm {
       }
     }
 
+    ~LiveRange() { delete segmentSet; }
+
     /// advanceTo - Advance the specified iterator to point to the Segment
     /// containing the specified position, or end() if the position is past the
     /// end of the range.  If no Segment contains this position, but the
@@ -741,6 +745,8 @@ namespace llvm {
 #endif
 
   private:
+    LiveInterval& operator=(const LiveInterval& rhs) = delete;
+
     /// Appends @p Range to SubRanges list.
     void appendSubRange(SubRange *Range) {
       Range->Next = SubRanges;

include/llvm/CodeGen/LiveStackAnalysis.h

@@ -21,7 +21,6 @@
 #include "llvm/Support/Allocator.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include <map>
-#include <unordered_map>
 
 namespace llvm {
 
@@ -34,7 +33,7 @@ namespace llvm {
 
     /// S2IMap - Stack slot indices to live interval mapping.
     ///
-    typedef std::unordered_map<int, LiveInterval> SS2IntervalMap;
+    typedef std::map<int, LiveInterval> SS2IntervalMap;
     SS2IntervalMap S2IMap;
 
     /// S2RCMap - Stack slot indices to register class mapping.

lib/CodeGen/LiveInterval.cpp

@@ -743,6 +743,7 @@ void LiveRange::flushSegmentSet() {
       segments.empty() &&
       "segment set can be used only initially before switching to the array");
   segments.append(segmentSet->begin(), segmentSet->end());
+  delete segmentSet;
   segmentSet = nullptr;
   verify();
 }

lib/CodeGen/LiveStackAnalysis.cpp

@@ -61,10 +61,8 @@ LiveStacks::getOrCreateInterval(int Slot, const TargetRegisterClass *RC) {
   assert(Slot >= 0 && "Spill slot indice must be >= 0");
   SS2IntervalMap::iterator I = S2IMap.find(Slot);
   if (I == S2IMap.end()) {
-    I = S2IMap.emplace(std::piecewise_construct, std::forward_as_tuple(Slot),
-                       std::forward_as_tuple(
-                           TargetRegisterInfo::index2StackSlot(Slot), 0.0F))
-            .first;
+    I = S2IMap.insert(I, std::make_pair(Slot,
+            LiveInterval(TargetRegisterInfo::index2StackSlot(Slot), 0.0F)));
     S2RCMap.insert(std::make_pair(Slot, RC));
   } else {
     // Use the largest common subclass register class.