[Lite] Enable bytecode flushing in lite mode.

Also declare an implication between --stress-flush-bytecode and --flush-bytecode

BUG=v8:8395

Change-Id: Ide60e17b283325c1142b07c4eb6f5c7af22d33e9
Reviewed-on: https://chromium-review.googlesource.com/c/1372070Reviewed-by: Mythri Alle <mythria@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58179}

src/flag-definitions.h

@@ -275,6 +275,12 @@ HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
 DEFINE_BOOL(icu_timezone_data, true, "get information about timezones from ICU")
 #endif
 
+#ifdef V8_LITE_MODE
+#define V8_LITE_BOOL true
+#else
+#define V8_LITE_BOOL false
+#endif
+
 #ifdef V8_ENABLE_FUTURE
 #define FUTURE_BOOL true
 #else
@@ -765,9 +771,10 @@ DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
 DEFINE_BOOL(never_compact, false,
             "Never perform compaction on full GC - testing only")
 DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
-DEFINE_BOOL(flush_bytecode, false,
+DEFINE_BOOL(flush_bytecode, V8_LITE_BOOL,
             "flush of bytecode when it has not been executed recently")
 DEFINE_BOOL(stress_flush_bytecode, false, "stress bytecode flushing")
+DEFINE_IMPLICATION(stress_flush_bytecode, flush_bytecode)
 DEFINE_BOOL(use_marking_progress_bar, true,
             "Use a progress bar to scan large objects in increments when "
             "incremental marking is active.")
@@ -1146,10 +1153,8 @@ DEFINE_SIZE_T(mock_arraybuffer_allocator_limit, 0,
 #undef FLAG
 #ifdef V8_LITE_MODE
 #define FLAG FLAG_READONLY
-#define V8_LITE_BOOL true
 #else
 #define FLAG FLAG_FULL
-#define V8_LITE_BOOL false
 #endif
 
 // Enable recompilation of function with optimized code.