Turn off reflexive optimized code map flushing.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/1533813002

Cr-Commit-Position: refs/heads/master@{#32941}

src/flag-definitions.h

@@ -387,7 +387,7 @@ DEFINE_INT(stress_runs, 0, "number of stress runs")
 DEFINE_BOOL(lookup_sample_by_shared, true,
             "when picking a function to optimize, watch for shared function "
             "info, not JSFunction itself")
-DEFINE_BOOL(flush_optimized_code_cache, true,
+DEFINE_BOOL(flush_optimized_code_cache, false,
             "flushes the cache of optimized code for closures on every GC")
 DEFINE_BOOL(inline_construct, true, "inline constructor calls")
 DEFINE_BOOL(inline_arguments, true, "inline functions with arguments object")