Revert^2 "Remove support for Valgrind in ART."

- Disable test configuration art-gtest-valgrind64
  (art-gtest-valgrind32 was already disabled).
- Remove Makefile logic regarding testing with Valgrind.
- Remove occurrences of `TEST_DISABLED_FOR_MEMORY_TOOL_VALGRIND`.
- Replace occurrences of `TEST_DISABLED_FOR_MEMORY_TOOL_ASAN` with
  `TEST_DISABLED_FOR_MEMORY_TOOL`.
- Replace the potentially dynamically evaluated
  `RUNNING_ON_MEMORY_TOOL` expression with constant
  `kRunningOnMemoryTool`.
- Simplify and fold the logic of
  `art::ArenaAllocatorMemoryToolCheckImpl` and
  `art::ArenaAllocatorMemoryToolCheck` into
  `art::ArenaAllocatorMemoryTool`.
- Adjust comments regarding memory tools.
- Remove Valgrind suppression files.
- Remove `--callgrind` option from tools/art.

This reverts commit 8b362a87d52a6668ffd2283ef6ffc274315f41c8.

Change-Id: I23c76845e6ccf766f19b22b58a0d5161f60842a9
Test: art/test.py
Test: art/test/testrunner/run_build_test_target.py art-asan
Bug: 77856586
Bug: 29282211
diff --git a/runtime/gc/allocator/rosalloc.h b/runtime/gc/allocator/rosalloc.h
index 150fe95..30213d5 100644
--- a/runtime/gc/allocator/rosalloc.h
+++ b/runtime/gc/allocator/rosalloc.h
@@ -625,7 +625,7 @@
 
   // If true, check that the returned memory is actually zero.
   static constexpr bool kCheckZeroMemory = kIsDebugBuild;
-  // Valgrind protects memory, so do not check memory when running under valgrind. In a normal
+  // Do not check memory when running under a memory tool. In a normal
   // build with kCheckZeroMemory the whole test should be optimized away.
   // TODO: Unprotect before checks.
   ALWAYS_INLINE bool ShouldCheckZeroMemory();
@@ -768,7 +768,7 @@
   // greater than or equal to this value, release pages.
   const size_t page_release_size_threshold_;
 
-  // Whether this allocator is running under Valgrind.
+  // Whether this allocator is running on a memory tool.
   bool is_running_on_memory_tool_;
 
   // The base address of the memory region that's managed by this allocator.