Implement liveness-aware CallTraceStorage with dropped trace handling

Major architectural changes:
- Replace monolithic CallTraceStorage with double-buffered hash table design
- Add CallTraceHashTable with lock-free concurrent access and instance-based trace IDs
- Implement liveness tracking system to preserve active traces across JFR dumps
- Add dropped trace handling for lock contention with proper JFR integration

Key features:
- 64-bit trace IDs combining instance ID and slot for collision avoidance
- Split-lock strategy minimizing exclusive lock time during trace collection
- Platform-specific ASGCT_CallFrame alignment using LP64_ONLY macro
- Comprehensive test coverage including contention and liveness scenarios

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jbachorik

ddprof-lib/src/main/cpp/arch_dd.h

@@ -3,6 +3,8 @@
 
 #include "arch.h"
 
+#define COMMA ,
+
 #include <stddef.h>
 
 static inline long long atomicInc(volatile long long &var,