[heap] Use size_t for heap and space counters.

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index 4d3195957e62da509bf165433387c3aaf3a3bb26..d4de79ef59a67b8016d902f93ba9246224b6a070 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -2912,8 +2912,9 @@ void Assembler::GrowBuffer() {
 
   // Some internal data structures overflow for very large buffers,
   // they must ensure that kMaximalBufferSize is not too large.
-  if ((desc.buffer_size > kMaximalBufferSize) ||
-      (desc.buffer_size > isolate()->heap()->MaxOldGenerationSize())) {
+  if (desc.buffer_size > kMaximalBufferSize ||
+      static_cast<size_t>(desc.buffer_size) >
+          isolate()->heap()->MaxOldGenerationSize()) {
     V8::FatalProcessOutOfMemory("Assembler::GrowBuffer");
   }