[tsan] Pass BP and stack bounds to Unwind() to get full stack traces on failed CHECKs

[kubamracek]

Summary

At least on Darwin, the fast unwinder called from TsanCheckFailed completely fails to unwind anything, because we don't give it a valid bp, stack_top and stack_bottom. Let's fix that.

[dvyukov]

lib/tsan/rtl/tsan_rtl_report.cc

700

This makes me nervous.
CHECK is the lowest tier functionality that should depend on as less things as possible. cur_thread may not be initialized yet, or already destroyed. On both mac and android it contains a bunch of CHECKs (i.e. you get silent crash on stack overflow), on mac mmap in cur_thread can fail (maybe we are CHECK-failed due to OOM), on android cur_thread can return fake dead_thread_state without stack info.
It's better to call GetThreadStackTopAndBottom here.

lib/tsan/rtl/tsan_rtl_report.cc

 // http://reviews.llvm.org/D19148#406208
 // Also see PR27280 comment 2 and 3 for breaking examples and analysis.
 ALWAYS_INLINE
 void PrintCurrentStackSlow(uptr pc) {
 #if !SANITIZER_GO
   BufferedStackTrace *ptrace =
       new(internal_alloc(MBlockStackTrace, sizeof(BufferedStackTrace)))
           BufferedStackTrace();
-  ptrace->Unwind(kStackTraceMax, pc, 0, 0, 0, 0, false);
+  uptr stack_bottom = cur_thread()->stk_addr;
+  uptr stack_top = stack_bottom + cur_thread()->stk_size;
+  uptr bp = GET_CURRENT_FRAME();
+  ptrace->Unwind(kStackTraceMax, pc, bp, 0, stack_top, stack_bottom, false);
   for (uptr i = 0; i < ptrace->size / 2; i++) {
     uptr tmp = ptrace->trace_buffer[i];
     ptrace->trace_buffer[i] = ptrace->trace_buffer[ptrace->size - i - 1];
     ptrace->trace_buffer[ptrace->size - i - 1] = tmp;
   }
   PrintStack(SymbolizeStack(*ptrace));
 #endif
 }