Revert "Remove obsolete call to AsyncSignalSafeLazyInitiFakeStack."

[kda]

Summary

This reverts commit 07481b37961f5b9a670c924367d2ead2e3c32b86.

[vitalybuka]

Reason for revert: it introduced unexplained memory leak.

compiler-rt/lib/asan/asan_thread.cpp

void AsanThread::Init(const InitOptions *options) {
   SetThreadStackAndTls(options);
   if (stack_top_ != stack_bottom_) {
     CHECK_GT(this->stack_size(), 0U);
     CHECK(AddrIsInMem(stack_bottom_));
     CHECK(AddrIsInMem(stack_top_ - 1));
   }
   ClearShadowForThreadStackAndTLS();
   fake_stack_ = nullptr;
+  if (__asan_option_detect_stack_use_after_return &&
+      tid() == GetCurrentTidOrInvalid()) {
+    // AsyncSignalSafeLazyInitFakeStack makes use of threadlocals and must be
+    // called from the context of the thread it is initializing, not its parent.
+    // Most platforms call AsanThread::Init on the newly-spawned thread, but
+    // Fuchsia calls this function from the parent thread.  To support that
+    // approach, we avoid calling AsyncSignalSafeLazyInitFakeStack here; it will
+    // be called by the new thread when it first attempts to access the fake
+    // stack.
+    AsyncSignalSafeLazyInitFakeStack();
+  }
   int local = 0;
   VReport(1, "T%d: stack [%p,%p) size 0x%zx; local=%p\n", tid(),
           (void *)stack_bottom_, (void *)stack_top_, stack_top_ - stack_bottom_,
           &local);
 }
 
 // Fuchsia doesn't use ThreadStart.
 // asan_fuchsia.c definies CreateMainThread and SetThreadStackAndTls.