Record seperate virtual instance types for boilerplates and their properties
and elements. This CL adds:
- BOILERPLATE_PROPERTY_ARRAY_TYPE
- BOILERPLATE_NAME_DICTIONARY_TYPE
- BOILERPLATE_ELEMENTS_TYPE


Bug: v8:7266
Change-Id: I2e6643d4bf067aa52eb1950a696b6535b020b097
Reviewed-on: https://chromium-review.googlesource.com/867059
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50592}