For fulfilling this purpose, the |opcode| field in the
|spv_parsed_instruction_t| struct is changed to of type uint16_t.
Also add functions to query the information of a given SPIR-V
target environment.
Users always want to run all the checks. The spv_validate_options_t
mechanism, which provides little benefits to users, complicates the
internal implementation and also makes the tests exercise different
paths as users do.
Right now the tests are more like integration tests instead of
unit tests, which should be our next refactoring aim.
Replace two other, imperfect mechanisms for use-def tracking.
Use ValidationState_t::entry_points to track entry points.
Concentrate undefined-ID diagnostics in a single place.
Move validate_types.h content into validate.h due to increased
inter-dependency.
Track uses of all IDs: TYPE_ID, SCOPE_ID, ...
Also update some blurbs.
Fix entry-point accumulation and move it outside ProcessIds().
Remove validate_types.h from CMakeLists.txt.
Blurb for spvIsIdType.
Remove redundant diagnostics for undefined IDs.
Join "can not" and reformat.
