Inclusive language fixes in ART's heap dump (`hprof`) feature.

Update language to comply with Android’s inclusive language guidance.
See https://source.android.com/setup/contribute/respectful-code for
reference.

#inclusivefixit

Test: Build ART and run ART tests
Bug: 161336379
Bug: 161896447
Change-Id: Ifaaa5b6d264614222a88f3c215b358bec6be0bda
diff --git a/runtime/hprof/hprof.cc b/runtime/hprof/hprof.cc
index 27560c8..5e4a5f3 100644
--- a/runtime/hprof/hprof.cc
+++ b/runtime/hprof/hprof.cc
@@ -682,7 +682,7 @@
   }
 
   void WriteStackTraces() REQUIRES_SHARED(Locks::mutator_lock_) {
-    // Write a dummy stack trace record so the analysis tools don't freak out.
+    // Write a fake stack trace record so the analysis tools don't freak out.
     output_->StartNewRecord(HPROF_TAG_STACK_TRACE, kHprofTime);
     __ AddStackTraceSerialNumber(kHprofNullStackTrace);
     __ AddU4(kHprofNullThread);