When type_specifier_nonarray gets parsed the scope gets saved into
TType and the code becomes repetitive. Setting of the scope is moved
to type_specifier_no_prec as it occurs less times.

BUG=angleproject:911

TEST=angle_unittests
TEST=angle_end2end_tests

Change-Id: I6da5fe7bc2d60ba2996221af71b719b818f5e9b1
Reviewed-on: https://chromium-review.googlesource.com/380535
Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>