fix(test): reduce ASAN wall-clock rate in BoundMethodHandleProfilerTest to avoid OOM (#630)

BoundMethodHandleProfilerTest sampled at wall=100us (~10k samples/s). Under
ASAN the bound-method-handle workload runs for minutes, and because wall-clock
sampling is time-based, a slow aarch64 CI runner accumulates a huge number of
MethodSample events. verifyEvents() then loads the entire recording into a JMC
object model inside the 512MB ASAN test heap (-Xmx512m), causing an OOM (or the
multi-minute runtime trips the CI job timeout).

Coarsen the sampling to wall=1ms under ASAN (10x fewer samples, independent of
runner speed) and drop the aarch64+asan workload from 1000 to 500 handles for
margin. Verified on aarch64: MethodSample count drops from 57,735 to 275 while
the test still passes.

Environment: Datadog workspace

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: rkennke

ddprof-test/src/test/java/com/datadoghq/profiler/metadata/BoundMethodHandleProfilerTest.java

@@ -15,7 +15,13 @@
 public class BoundMethodHandleProfilerTest extends AbstractProfilerTest {
     @Override
     protected String getProfilerCommand() {
-        return Platform.isJ9() ? "wall=100ms" : "wall=100us";
+        if (Platform.isJ9()) {
+            return "wall=100ms";
+        }
+        // wall=100us is ~10k samples/s. Under ASAN the workload runs for minutes,
+        // producing a JFR too large for JMC to load into the 512MB test heap. Sampling
+        // 10x coarser cuts both the recording size and the SIGVTALRM overhead.
+        return isAsan() ? "wall=1ms" : "wall=100us";
     }
 
     @Test
@@ -26,8 +32,10 @@ public void test() throws Throwable {
         assumeFalse(Platform.isAarch64() && Platform.isMusl() && !Platform.isJavaVersionAtLeast(11)); // aarch64 + musl + jdk 8 will crash very often
         registerCurrentThreadForWallClockProfiling();
         // Reduce workload on aarch64+asan: ASAN slows each invocation enough that the test
-        // takes 3+ minutes, generating a 56MB JFR that OOMs the 512MB test-runner heap.
-        int numBoundMethodHandles = isAsan() && Platform.isAarch64() ? 1_000 : 10_000;
+        // takes 3+ minutes, generating a JFR that OOMs the 512MB test-runner heap. Combined
+        // with the coarser wall rate in getProfilerCommand(), 500 keeps the recording small
+        // while still generating enough bound-method-handle classes to sample.
+        int numBoundMethodHandles = isAsan() && Platform.isAarch64() ? 500 : 10_000;
         int x = generateBoundMethodHandles(numBoundMethodHandles);
         assertTrue(x != 0);
         stopProfiler();