Do not allow large object allocation from optimized code.

src/ppc/lithium-codegen-ppc.cc

Index: src/ppc/lithium-codegen-ppc.cc
diff --git a/src/ppc/lithium-codegen-ppc.cc b/src/ppc/lithium-codegen-ppc.cc
index 756b6476af4c396b1d7682387c6dc42c3352592c..2a5428527705c4018c29231b7ff4fe330c205af5 100644
--- a/src/ppc/lithium-codegen-ppc.cc
+++ b/src/ppc/lithium-codegen-ppc.cc
@@ -5598,11 +5598,8 @@ void LCodeGen::DoAllocate(LAllocate* instr) {
 
   if (instr->size()->IsConstantOperand()) {
     int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
-    if (size <= Page::kMaxRegularHeapObjectSize) {
-      __ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
-    } else {
-      __ b(deferred->entry());
-    }
+    CHECK(size <= Page::kMaxRegularHeapObjectSize);
+    __ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);
   } else {
     Register size = ToRegister(instr->size());
     __ Allocate(size, result, scratch, scratch2, deferred->entry(), flags);