Translator: Clean up type cloning TType has a constructor that aids cloning + helpers to convert between types. A number of places where a type is constructed from the information gathered from another type is changed to clone the type and then use one of these helpers. This clean up is part of an ongoing work to improve precision handling. This change removes many references to TType::getPrecision(). Bug: angleproject:4889 Change-Id: Ib85659ab5363b56ad298f8648fca856edc1ebf8b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3063944 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>