[profiler] reduce incorrectly unaccounted ticks.

No longer invalidate the tick sample if there is no JS frame or only one
non-interpreted JS frame on the stack.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2799603005
Cr-Original-Commit-Position: refs/heads/master@{#44465}
Committed: https://chromium.googlesource.com/v8/v8/+/57bef9a1e2621555f70b9258593ae4a4235307ef
Review-Url: https://codereview.chromium.org/2799603005
Cr-Commit-Position: refs/heads/master@{#44478}

src/profiler/tick-sample.cc

@@ -225,12 +225,7 @@ bool TickSample::GetStackSample(Isolate* v8_isolate, RegisterState* regs,
   i::SafeStackFrameIterator it(isolate, reinterpret_cast<i::Address>(regs->fp),
                                reinterpret_cast<i::Address>(regs->sp),
                                js_entry_sp);
-
-  // If at this point iterator does not see any frames,
-  // is usually means something is wrong with the FP,
-  // e.g. it is used as a general purpose register in the function.
-  // Bailout.
-  if (it.done()) return false;
+  if (it.done()) return true;
 
   size_t i = 0;
   if (record_c_entry_frame == kIncludeCEntryFrame &&