fix(core.utils): key helper passes target_type to ProgramOptions.as_bytes

cuda.core's ProgramOptions.as_bytes learned a target_type parameter so
that NVVM compilations can inject -gen-lto for ltoir targets. Forward
target_type from make_program_cache_key so the canonical option bytes
reflect this when available, falling back to the one-argument signature
on older builds.

Part of issue #178.

Author: cpcloud

cuda_core/cuda/core/utils/_program_cache.py

@@ -221,7 +221,13 @@ def make_program_cache_key(
         )
 
     backend = _backend_for_code_type(code_type)
-    option_bytes = options.as_bytes(backend)  # list[bytes], canonical form
+    # ProgramOptions.as_bytes may or may not accept target_type depending on
+    # the cuda.core version; pass it through when it does so the key reflects
+    # any target-specific flags (e.g. NVVM's ``-gen-lto`` for ltoir).
+    try:
+        option_bytes = options.as_bytes(backend, target_type)
+    except TypeError:
+        option_bytes = options.as_bytes(backend)
     names = tuple(sorted(str(n) for n in name_expressions))
 
     hasher = hashlib.blake2b(digest_size=32)