Remove inline caches (#884)

Inline caches are supposed to improve performance but benchmarks show
it's currently a mixed bag: sometimes faster, sometimes slower, always
more memory hungry. After due consideration, I think it's better to
remove the current implementation and start afresh.

Refs: #876

Author: bnoordhuis

quickjs-opcode.h

@@ -365,11 +365,6 @@ DEF(        is_null, 1, 1, 1, none)
 DEF(typeof_is_undefined, 1, 1, 1, none)
 DEF( typeof_is_function, 1, 1, 1, none)
 
-// order matters, see non-IC counterparts
-DEF(      get_field_ic, 5, 1, 1, none)
-DEF(     get_field2_ic, 5, 1, 2, none)
-DEF(      put_field_ic, 5, 2, 0, none)
-
 #undef DEF
 #undef def
 #endif  /* DEF */