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

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 1d7c8c1b0c6f86ab6bf716e788729f5c6f483968..b449d10aa94b6696ba4b8ca10d89278b7fe7f930 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -5153,7 +5153,8 @@ 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, temp, no_reg, deferred->entry(), flags);
     } else {
       __ jmp(deferred->entry());