[vm] Remove Script::compile_time_constants_.

Dead since 5cce1e4acd.

TEST=ci
Change-Id: I50e8bc9eea9625120c5038b29deb6b2ee33dd6c0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/202306
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Ben Konyi <bkonyi@google.com>

runtime/vm/raw_object_fields.cc

@@ -43,7 +43,6 @@ namespace dart {
   F(Field, host_offset_or_field_id_)                                           \
   F(Script, url_)                                                              \
   F(Script, resolved_url_)                                                     \
-  F(Script, compile_time_constants_)                                           \
   F(Script, line_starts_)                                                      \
   F(Script, debug_positions_)                                                  \
   F(Script, kernel_program_info_)                                              \