tsan: Support constructor arguments via New

[melver]

Summary

Make New<>() a variadic function template and forward any arguments to
the constructor. std::forward<>() is inlined to avoid including
<utility>.

compiler-rt/lib/tsan/rtl/tsan_mman.h

 // Invoking malloc/free hooks that may be installed by the user.
 void invoke_malloc_hook(void *ptr, uptr size);
 void invoke_free_hook(void *ptr);
 
 // For internal data structures.
 void *Alloc(uptr sz);
 void FreeImpl(void *p);
 
-template <typename T>
-T *New() {
-  return new (Alloc(sizeof(T))) T();
+template <typename T, typename... Args>
+T *New(Args &&...args) {
+  return new (Alloc(sizeof(T))) T(static_cast<Args &&>(args)...);
 }
 
 template <typename T>
 void Free(T *&p) {
   if (p == nullptr)
     return;
   FreeImpl(p);
   p = nullptr;

compiler-rt/lib/tsan/rtl/tsan_rtl.cpp

if (hdr_end < hdr + sizeof(Trace)) {
     ReleaseMemoryPagesToOS(hdr_end, hdr + sizeof(Trace));
     uptr unused = hdr + sizeof(Trace) - hdr_end;
     if (hdr_end != (uptr)MmapFixedNoAccess(hdr_end, unused)) {
       Report("ThreadSanitizer: failed to mprotect(%p, %p)\n",
           hdr_end, unused);
       CHECK("unable to mprotect" && 0);
     }
   }
-  return new (Alloc(sizeof(ThreadContext))) ThreadContext(tid);
+  return New<ThreadContext>(tid);
 }
 
 #if !SANITIZER_GO
 static const u32 kThreadQuarantineSize = 16;
 #else
 static const u32 kThreadQuarantineSize = 64;
 #endif