Add classfile-api module: java.lang.classfile (JEP 484) parse, generate, transform with timing instrumentation, ASM 9.11.1 comparison, version limits, JDK 24/25/26 API diff

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b4VQVEJWetTT1dYzyJ

classfile-api/output/05-transform.txt

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+$ java -cp classes:asm-9.11.1.jar... demo.TransformDemo target/instrumented      (25.0.5+8-LTS)
+original 1488 bytes, naive 1799 bytes, with exception handler 2155 bytes
+-- naive: time normal returns only (1799 bytes; verify() problems: 0)
+PASS naive: time normal returns only: demo.Target here is a different Class object than the one on the class path
+  boom() threw java.lang.IllegalStateException: boom
+  explode() threw ArrayIndexOutOfBoundsException
+  fib      recorded 177 call(s)
+  sumTo    recorded   1 call(s)
+  greet    recorded   1 call(s)
+  pause    recorded   1 call(s)
+  boom     recorded   0 call(s)
+  explode  recorded   0 call(s)
+PASS naive version never records the two methods that throw
+PASS fib(10) makes 177 calls and 177 timings were recorded (recursion included)
+-- full: also time when an exception leaves the method (2155 bytes; verify() problems: 0)
+PASS full: also time when an exception leaves the method: demo.Target here is a different Class object than the one on the class path
+  boom() threw java.lang.IllegalStateException: boom
+  explode() threw ArrayIndexOutOfBoundsException
+  fib      recorded 177 call(s)
+  sumTo    recorded   1 call(s)
+  greet    recorded   1 call(s)
+  pause    recorded   1 call(s)
+  boom     recorded   1 call(s)
+  explode  recorded   1 call(s)
+PASS exception-safe version records boom() and explode() once each
+PASS fib still recorded 177 times
+PASS sumTo and greet recorded once each
+PASS pause(50) was recorded as at least 50 ms (>= 50,000,000 ns)
+PASS fib(20) gives the same answer before and after
+PASS sumTo(12345) gives the same answer before and after
+exit=0