Remove obsolete call to AsyncSignalSafeLazyInitiFakeStack.

[kda]

Summary

Code was originally added for Myriad D46626 which was removed
with D104279.

related to: https://github.com/google/sanitizers/issues/1394

[vitalybuka]

I've updated summary.
Could you "arc amend" to include it into your git commit.

[morehouse]

Cool!

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.