[sanitizers][NFC] Change typesto avoid warnings

Warning was enabled by D94640

compiler-rt/lib/sanitizer_common/sanitizer_allocator_primary64.h

@@ -371,8 +371,7 @@ class SizeClassAllocator64 {
     }
     ~PackedCounterArray() {
       if (buffer) {
-        memory_mapper->UnmapPackedCounterArrayBuffer(
-            reinterpret_cast<uptr>(buffer), buffer_size);
+        memory_mapper->UnmapPackedCounterArrayBuffer(buffer, buffer_size);
       }
     }
 
@@ -803,17 +802,16 @@ class SizeClassAllocator64 {
       return released_bytes;
     }
 
-    uptr MapPackedCounterArrayBuffer(uptr buffer_size) {
+    void *MapPackedCounterArrayBuffer(uptr buffer_size) {
       // TODO(alekseyshl): The idea to explore is to check if we have enough
       // space between num_freed_chunks*sizeof(CompactPtrT) and
       // mapped_free_array to fit buffer_size bytes and use that space instead
       // of mapping a temporary one.
-      return reinterpret_cast<uptr>(
-          MmapOrDieOnFatalError(buffer_size, "ReleaseToOSPageCounters"));
+      return MmapOrDieOnFatalError(buffer_size, "ReleaseToOSPageCounters");
     }
 
-    void UnmapPackedCounterArrayBuffer(uptr buffer, uptr buffer_size) {
-      UnmapOrDie(reinterpret_cast<void *>(buffer), buffer_size);
+    void UnmapPackedCounterArrayBuffer(void *buffer, uptr buffer_size) {
+      UnmapOrDie(buffer, buffer_size);
     }
 
     // Releases [from, to) range of pages back to OS.

compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cpp

@@ -1081,11 +1081,11 @@ class NoMemoryMapper {
 
   NoMemoryMapper() : last_request_buffer_size(0) {}
 
-  uptr MapPackedCounterArrayBuffer(uptr buffer_size) {
+  void *MapPackedCounterArrayBuffer(uptr buffer_size) {
     last_request_buffer_size = buffer_size;
-    return 0;
+    return nullptr;
   }
-  void UnmapPackedCounterArrayBuffer(uptr buffer, uptr buffer_size) {}
+  void UnmapPackedCounterArrayBuffer(void *buffer, uptr buffer_size) {}
 };
 
 class RedZoneMemoryMapper {
@@ -1100,14 +1100,15 @@ class RedZoneMemoryMapper {
     UnmapOrDie(buffer, 3 * GetPageSize());
   }
 
-  uptr MapPackedCounterArrayBuffer(uptr buffer_size) {
+  void *MapPackedCounterArrayBuffer(uptr buffer_size) {
     const auto page_size = GetPageSize();
     CHECK_EQ(buffer_size, page_size);
-    memset(reinterpret_cast<void*>(reinterpret_cast<uptr>(buffer) + page_size),
-           0, page_size);
-    return reinterpret_cast<uptr>(buffer) + page_size;
+    void *p =
+        reinterpret_cast<void *>(reinterpret_cast<uptr>(buffer) + page_size);
+    memset(p, 0, page_size);
+    return p;
   }
-  void UnmapPackedCounterArrayBuffer(uptr buffer, uptr buffer_size) {}
+  void UnmapPackedCounterArrayBuffer(void *buffer, uptr buffer_size) {}
 
  private:
   void *buffer;
@@ -1227,12 +1228,12 @@ class ReleasedPagesTrackingMemoryMapper {
  public:
   std::set<u32> reported_pages;
 
-  uptr MapPackedCounterArrayBuffer(uptr buffer_size) {
+  void *MapPackedCounterArrayBuffer(uptr buffer_size) {
     reported_pages.clear();
-    return reinterpret_cast<uptr>(calloc(1, buffer_size));
+    return calloc(1, buffer_size);
   }
-  void UnmapPackedCounterArrayBuffer(uptr buffer, uptr buffer_size) {
-    free(reinterpret_cast<void*>(buffer));
+  void UnmapPackedCounterArrayBuffer(void *buffer, uptr buffer_size) {
+    free(buffer);
   }
 
   void ReleasePageRangeToOS(u32 from, u32 to) {