Remove destructuring and default arguments runtime flags

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index bcf753d1e1ad92824aa7b0da6308fdca99c4e2cc..72356e7f45a0f1b0eefde991ea0b528a91d72554 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -221,9 +221,6 @@ DEFINE_IMPLICATION(es_staging, harmony_tailcalls)
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                               \
-  V(harmony_default_parameters, "harmony default parameters")             \
-  V(harmony_destructuring_assignment, "harmony destructuring assignment") \
-  V(harmony_destructuring_bind, "harmony destructuring bind")             \
   V(harmony_function_name, "harmony Function name inference")             \
   V(harmony_iterator_close, "harmony iterator finalization")              \
   V(harmony_tostring, "harmony toString")                                 \
@@ -265,10 +262,6 @@ HARMONY_SHIPPING(FLAG_SHIPPING_FEATURES)
 DEFINE_IMPLICATION(harmony_sloppy_let, harmony_sloppy)
 DEFINE_IMPLICATION(harmony_sloppy_function, harmony_sloppy)
 
-// Destructuring shares too much parsing architecture with default parameters
-// to be enabled on its own.
-DEFINE_IMPLICATION(harmony_destructuring_bind, harmony_default_parameters)
-
 // Flags for experimental implementation features.
 DEFINE_BOOL(compiled_keyed_generic_loads, false,
             "use optimizing compiler to generate keyed generic load stubs")