Fix v8::internal::Simulator::ResetState on arm

BUG=chromium:894427
R=machenbach

Change-Id: I129f512960ffc81b607bcdae1e43ddb94358d1df
Reviewed-on: https://chromium-review.googlesource.com/c/1277609Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56580}

src/arm64/simulator-arm64.cc

@@ -362,7 +362,7 @@ void Simulator::ResetState() {
   set_lr(kEndOfSimAddress);
 
   // Reset debug helpers.
-  breakpoints_.empty();
+  breakpoints_.clear();
   break_on_next_ = false;
 }