Nit: typo _asyncSet.. -> _setAsyncThreadStackTrace

TEST=None. It's a nit typo in a comment.

Change-Id: I80c1fc1c1dd59c3e841791b6134e4c06fd866358
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/169886
Reviewed-by: Clement Skau <cskau@google.com>
Commit-Queue: Clement Skau <cskau@google.com>
diff --git a/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc b/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
index bcb3306..6ae6804 100644
--- a/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
+++ b/runtime/vm/compiler/frontend/kernel_binary_flowgraph.cc
@@ -504,7 +504,7 @@
 
   Fragment code;
   code += LoadLocal(async_stack_trace_var);
-  // Call _asyncSetThreadStackTrace
+  // Call _setAsyncThreadStackTrace
   code += StaticCall(TokenPosition::kNoSource, target,
                      /* argument_count = */ 1, ICData::kStatic);
   code += Drop();