8310541: G1: Remove redundant check in G1Policy::need_to_start_conc_mark

Reviewed-by: tschatzl, kbarrett

Author: albertnetymk

src/hotspot/share/gc/g1/g1Policy.cpp

@@ -707,7 +707,7 @@ bool G1Policy::need_to_start_conc_mark(const char* source, size_t alloc_word_siz
 
   bool result = false;
   if (marking_request_bytes > marking_initiating_used_threshold) {
-    result = collector_state()->in_young_only_phase() && !collector_state()->in_young_gc_before_mixed();
+    result = collector_state()->in_young_only_phase();
     log_debug(gc, ergo, ihop)("%s occupancy: " SIZE_FORMAT "B allocation request: " SIZE_FORMAT "B threshold: " SIZE_FORMAT "B (%1.2f) source: %s",
                               result ? "Request concurrent cycle initiation (occupancy higher than threshold)" : "Do not request concurrent cycle initiation (still doing mixed collections)",
                               cur_used_bytes, alloc_byte_size, marking_initiating_used_threshold, (double) marking_initiating_used_threshold / _g1h->capacity() * 100, source);