PPC/s390: [heap] Removed unused slow object lookup functions.

Port 01079cb8

R=hpayer@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I4b107ecdcd0759296daf6f6eb06b522bdfb36f44
Reviewed-on: https://chromium-review.googlesource.com/c/1340460Reviewed-by: Muntasir Mallick <mmallick@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#57586}

src/ppc/simulator-ppc.cc

@@ -404,8 +404,7 @@ void PPCDebugger::Debug() {
           HeapObject* obj = reinterpret_cast<HeapObject*>(*cur);
           intptr_t value = *cur;
           Heap* current_heap = sim_->isolate_->heap();
-          if (((value & 1) == 0) ||
-              current_heap->ContainsSlow(obj->address())) {
+          if (((value & 1) == 0) || current_heap->Contains(obj)) {
             PrintF(" (");
             if ((value & 1) == 0) {
               PrintF("smi %d", PlatformSmiTagging::SmiToInt(

src/s390/simulator-s390.cc

@@ -422,8 +422,7 @@ void S390Debugger::Debug() {
           HeapObject* obj = reinterpret_cast<HeapObject*>(*cur);
           intptr_t value = *cur;
           Heap* current_heap = sim_->isolate_->heap();
-          if (((value & 1) == 0) ||
-              current_heap->ContainsSlow(obj->address())) {
+          if (((value & 1) == 0) || current_heap->Contains(obj)) {
             PrintF("(smi %d)", PlatformSmiTagging::SmiToInt(
                                    reinterpret_cast<Address>(obj)));
           } else if (current_heap->Contains(obj)) {