[TableGen] Refactor Intrinsics record (#106986)

Eliminate unused `isTarget` field in Intrinsic record.

Eliminate `isOverloaded`, `Types` and `TypeSig` fields from the record,
as they are already available through the `TypeInfo` field. Change
intrinsic emitter code to look for this info using fields of the
`TypeInfo` record attached to the `Intrinsic` record.

Fix several intrinsic related unit tests to source the `Intrinsic` class
def from Intrinsics.td as opposed to defining a skeleton in the test.

This eliminates some duplication of information in the Intrinsic class,
as well as reduces the memory allocated for record fields, resulting in
~2% reduction (though that's not the main goal).

0 files changed, 0 insertions, 0 deletions