[scudo] Pass MapPlatformData in more calls

[ddcc]

Summary

Allow platforms to avoid looking up private data by providing private context

[ddcc]

Fix duplicate variable

[vitalybuka]

compiler-rt/lib/scudo/standalone/release.h

141

Data -> MapData

compiler-rt/lib/scudo/standalone/vector.h

94

PlatformData -> MapData

95

Can you make it the last member as well?

[ddcc]

Rename variable and reorder

[vitalybuka]

compiler-rt/lib/scudo/standalone/vector.h

98

Can you please mark them both with [[no_unique_address]] to avoid vector size increase on other platforms

[vitalybuka]

compiler-rt/lib/scudo/standalone/vector.h

98

Can you please mark them both with [[no_unique_address]] to avoid vector size increase on other platforms

Looks like you missed the last comment

[ddcc]

Oops I did, I'll add another commit for that.

compiler-rt/lib/scudo/standalone/release.h

private:
   uptr CounterSizeBitsLog;
   uptr CounterMask;
   uptr PackingRatioLog;
   uptr BitOffsetMask;
 
   uptr SizePerRegion;
   uptr BufferSize;
   uptr *Buffer;
-  MapPlatformData MapData = {};
+  [[no_unique_address]] MapPlatformData MapData = {};
 
   static HybridMutex Mutex;
   static uptr StaticBuffer[StaticBufferCount];
 };
 
 template <class ReleaseRecorderT> class FreePagesRangeTracker {
 public:
   explicit FreePagesRangeTracker(ReleaseRecorderT *Recorder)

compiler-rt/lib/scudo/standalone/vector.h

void reallocate(uptr NewCapacity) {
     T *NewData = reinterpret_cast<T *>(
         map(nullptr, NewCapacity, "scudo:vector", 0, &MapData));
     memcpy(NewData, Data, Size * sizeof(T));
     destroy();
     Data = NewData;
     CapacityBytes = NewCapacity;
   }
 
   T *Data = nullptr;
   T LocalData[256 / sizeof(T)] = {};
   uptr CapacityBytes = 0;
   uptr Size = 0;
-  MapPlatformData MapData = {};
+  [[no_unique_address]] MapPlatformData MapData = {};
 };
 
 template <typename T> class Vector : public VectorNoCtor<T> {
 public:
   constexpr Vector() { VectorNoCtor<T>::init(); }
   explicit Vector(uptr Count) {
     VectorNoCtor<T>::init(Count);
     this->resize(Count);