[Interpreter] Add option to trace bytecode execution.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 8a9436e6b26aa634096790ea7d51ad68eff4c126..99ad02020a30785d09f13ba208e1344edbcea997 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -144,6 +144,11 @@ struct MaybeBoolFlag {
 #else
 # define ENABLE_NEON_DEFAULT false
 #endif
+#ifdef V8_OS_WIN
+# define ENABLE_LOG_COLOUR false
+#else
+# define ENABLE_LOG_COLOUR true
+#endif
 
 #define DEFINE_BOOL(nam, def, cmt) FLAG(BOOL, bool, nam, def, cmt)
 #define DEFINE_BOOL_READONLY(nam, def, cmt) \
@@ -301,6 +306,8 @@ DEFINE_BOOL(ignition, false, "use ignition interpreter")
 DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
 DEFINE_BOOL(print_bytecode, false,
             "print bytecode generated by ignition interpreter")
+DEFINE_BOOL(trace_ignition, false,
+            "trace the bytecodes executed by the ignition interpreter")
 DEFINE_BOOL(trace_ignition_codegen, false,
             "trace the codegen of ignition interpreter bytecode handlers")
 
@@ -787,7 +794,8 @@ DEFINE_INT(sim_stack_size, 2 * MB / KB,
            "in kBytes (default is 2 MB)")
 DEFINE_BOOL(log_regs_modified, true,
             "When logging register values, only print modified registers.")
-DEFINE_BOOL(log_colour, true, "When logging, try to use coloured output.")
+DEFINE_BOOL(log_colour, ENABLE_LOG_COLOUR,
+            "When logging, try to use coloured output.")
 DEFINE_BOOL(ignore_asm_unimplemented_break, false,
             "Don't break for ASM_UNIMPLEMENTED_BREAK macros.")
 DEFINE_BOOL(trace_sim_messages, false,