Do not overwrite hidden access flags for intrinsics

Deduplicating warnings works by overwriting the runtime access flags
of a method/field to move it from a greylist to the whitelist. This
triggers a CHECK when attempted on an intrinsic as their ordinal bits
clash with the hidden API access flags. Do not attempt to deduplicate
for those.

Bug: 78574586
Test: (cd cts/tests/signature ; ./runSignatureTests.sh)
Merged-In: I39e555a0f4cd5f662eea348baf4ef72a5827306d
Change-Id: I39e555a0f4cd5f662eea348baf4ef72a5827306d
(cherry picked from commit 8a6b2f33)