fix(compile): opt in to -asm-verbose explicitly; restore get_occupancy

The companion LLVM patch (ROCm/llvm-project#3177) now makes ROCDL's
AsmVerbose an opt-in via `-asm-verbose` in gpu-module-to-binary's `opts`
argument rather than always-on, so pass it explicitly from _dump_isa.

Also restores flydsl.utils.kernel_info.get_occupancy(), which was
dropped from the previous commit by an editing mishap despite still
being imported by tests/unit/test_kernel_info.py.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Author: fsx950223

python/flydsl/compiler/jit_function.py

@@ -686,8 +686,9 @@ def _dump_isa(*, dump_dir: Path, ctx: ir.Context, asm: str, verify: bool, stage_
         di_pass = (
             "ensure-debug-info-scope-on-llvm-func{emission-kind=LineTablesOnly}," if env.debug.enable_debug_info else ""
         )
+        cmd_opts = "-asm-verbose" + (" -g" if env.debug.enable_debug_info else "")
         pm = PassManager.parse(
-            f'builtin.module({di_pass}gpu-module-to-binary{{format=isa opts="{"-g" if env.debug.enable_debug_info else ""}" section= toolkit=}})',
+            f'builtin.module({di_pass}gpu-module-to-binary{{format=isa opts="{cmd_opts}" section= toolkit=}})',
             context=ctx,
         )
         pm.enable_verifier(bool(verify))

python/flydsl/utils/kernel_info.py

@@ -21,7 +21,7 @@
 re-derive occupancy/register usage from device properties themselves.
 """
 
-from typing import Dict
+from typing import Dict, Optional
 
 KERNEL_INFO_HEADER = "; Kernel info:"
 
@@ -48,3 +48,9 @@ def parse_kernel_info(isa_text: str) -> Dict[str, str]:
         key, _, value = line.partition(":")
         info[key.strip()] = value.strip()
     return info
+
+
+def get_occupancy(isa_text: str) -> Optional[int]:
+    """Convenience accessor for the ``Occupancy`` field, as an int."""
+    value = parse_kernel_info(isa_text).get("Occupancy")
+    return int(value) if value is not None else None