Fix missing issue of kernel attributes including vec_type_hint,
work_group_size_hint and reqd_work_group_size.
Make WorkGroupInfo's meta attributes initialized before other parameters
are initialized.
This way workGroupInfo_'s compileSizeHint_, compileSize_ and
compileVecTypeHint_ will be valid when they are used to create kernel
signature in Kernel::createSignature().
Fix a typo of ".workgorup_size_hint".
Change-Id: I4a1ede2210a25596ad7a935cd4debb896e0147f8
Tao Sang
cb30ce4e06