Never call MacroAssembler::Allocate() with incorrect size.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index b9b67d9bbd01b1d5a5ce108e753d64d1f6fdd6eb..b900e86a14ec75e29d459a8d492029960356e8bf 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -1570,7 +1570,8 @@ void LCodeGen::DoAllocate(LAllocate* instr) {
 
   if (instr->size()->IsConstantOperand()) {
     int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
-    if (size <= Page::kMaxRegularHeapObjectSize) {
+    if (static_cast<uint32_t>(size) <=
+        static_cast<uint32_t>(Page::kMaxRegularHeapObjectSize)) {
       __ Allocate(size, result, temp1, temp2, deferred->entry(), flags);
     } else {
       __ B(deferred->entry());