Use a class field instead of global FLAG_debug_code in assember and

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 6652df27cf313e949cee3a4d8687308600002aaf..10364eb1b5ff5f65f98c178430d672c30e8a3376 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -299,7 +299,8 @@ static void InitCoverageLog();
 byte* Assembler::spare_buffer_ = NULL;
 
 Assembler::Assembler(void* buffer, int buffer_size)
-    : positions_recorder_(this) {
+    : positions_recorder_(this),
+      emit_debug_code_(FLAG_debug_code) {
   if (buffer == NULL) {
     // Do our own buffer management.
     if (buffer_size <= kMinimalBufferSize) {
@@ -2761,7 +2762,7 @@ void Assembler::RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data) {
       Serializer::TooLateToEnableNow();
     }
 #endif
-    if (!Serializer::enabled() && !FLAG_debug_code) {
+    if (!Serializer::enabled() && !emit_debug_code()) {
       return;
     }
   }