VM: Remove ZoneCompileType class.

VM: Remove ZoneCompileType class.

This auxiliary wrapper was introduced originally to work-around an assertion
in ZoneAllocated destructor which was preventing us from using descendants of
ZoneAllocated as value objects. That assertion was removed some time ago
which means ZoneCompileType is not needed anymore and CompileType can
become ZoneAllocated instead.

R=fschneider@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/da5cd4197a3f2bd4730de36b72475b34378f9dba

[Florian Schneider, 2017-03-07 16:04:52]

lgtm

[Vyacheslav Egorov (Google), 2017-03-07 16:29:05]

Description was changed from

==========
VM: Remove ZoneCompileType class.

This auxiliary wrapper was introduced originally to work-around an assertion
in ZoneAllocated destructor which was preventing us from using descendants of
ZoneAllocated as value objects. That assertion was removed some time ago
which means ZoneCompileType is not needed anymore and CompileType can
become ZoneAllocated instead.

R=fschneider@google.com
BUG=
==========

to

==========
VM: Remove ZoneCompileType class.

This auxiliary wrapper was introduced originally to work-around an assertion
in ZoneAllocated destructor which was preventing us from using descendants of
ZoneAllocated as value objects. That assertion was removed some time ago
which means ZoneCompileType is not needed anymore and CompileType can
become ZoneAllocated instead.

R=fschneider@google.com
BUG=

Committed:
https://github.com/dart-lang/sdk/commit/da5cd4197a3f2bd4730de36b72475b34378f9dba
==========

[Vyacheslav Egorov (Google), 2017-03-07 16:29:07]

Committed patchset #1 (id:1) manually as
da5cd4197a3f2bd4730de36b72475b34378f9dba (presubmit successful).