Contribution of PowerPC port.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index fd08c8292f812c8c3084fb699eb9f65dcc98b4a7..41005e3409640e6ac6f91829d4e9f1a22575190d 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -31,6 +31,10 @@
 #include "src/v8threads.h"
 #include "src/vm-state-inl.h"
 
+#if V8_TARGET_ARCH_PPC && !V8_INTERPRETED_REGEXP
+#include "src/regexp-macro-assembler.h"  // NOLINT
+#include "src/ppc/regexp-macro-assembler-ppc.h"  // NOLINT
+#endif
 #if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP
 #include "src/regexp-macro-assembler.h"          // NOLINT
 #include "src/arm/regexp-macro-assembler-arm.h"  // NOLINT
@@ -43,6 +47,7 @@
 #include "src/regexp-macro-assembler.h"
 #include "src/mips64/regexp-macro-assembler-mips64.h"
 #endif
+#include "src/full-codegen.h"
 
 namespace v8 {
 namespace internal {
@@ -814,7 +819,8 @@ bool Heap::CollectGarbage(GarbageCollector collector, const char* gc_reason,
       !incremental_marking()->should_hurry() &&
       FLAG_incremental_marking_steps) {
     // Make progress in incremental marking.
-    const intptr_t kStepSizeWhenDelayedByScavenge = 1 * MB;
+    const intptr_t kStepSizeWhenDelayedByScavenge = 1 * MB *
+      FullCodeGenerator::kCodeSizeMultiplier / 100;
     incremental_marking()->Step(kStepSizeWhenDelayedByScavenge,
                                 IncrementalMarking::NO_GC_VIA_STACK_GUARD);
     if (!incremental_marking()->IsComplete() && !FLAG_gc_global) {