[Sanitizer] Use a common mutex to prevent mixing reports from different sanitizers. This fixes PR15516

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178853 91177308-0d34-0410-b5e6-96231b3b80d8
Remove InternalAlloc/InternalFree calls from StopTheWorld. Patch by Sergey Matveev.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178855 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] init-order checker tests: move constexpr test that requires -std=c++11 to a separate test case. Check that structs with no ctor but non-trivial dtor are ignored.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178857 91177308-0d34-0410-b5e6-96231b3b80d8