[OpenMP][NFC] Remove unused debug lock (llvm#127928)

Author: Jonathan Peyton

openmp/runtime/src/kmp.h

@@ -3408,7 +3408,6 @@ extern kmp_bootstrap_lock_t
                              __kmp_threads expansion to co-exist */
 
 extern kmp_lock_t __kmp_global_lock; /* control OS/global access  */
-extern kmp_lock_t __kmp_debug_lock; /* control I/O access for KMP_DEBUG */
 
 extern enum library_type __kmp_library;
 

openmp/runtime/src/kmp_global.cpp

@@ -487,8 +487,6 @@ KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
 
 KMP_ALIGN_CACHE_INTERNODE
 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
-KMP_ALIGN_CACHE_INTERNODE
-KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
 #else
 KMP_ALIGN_CACHE
 
@@ -505,8 +503,6 @@ KMP_BOOTSTRAP_LOCK_INIT(__kmp_tp_cached_lock);
 
 KMP_ALIGN(128)
 KMP_LOCK_INIT(__kmp_global_lock); /* Control OS/global access */
-KMP_ALIGN(128)
-KMP_LOCK_INIT(__kmp_debug_lock); /* Control I/O access for KMP_DEBUG */
 #endif
 
 /* ----------------------------------------------- */

openmp/runtime/src/kmp_runtime.cpp

@@ -7143,7 +7143,6 @@ static void __kmp_do_serial_initialize(void) {
   __kmp_stats_init();
 #endif
   __kmp_init_lock(&__kmp_global_lock);
-  __kmp_init_lock(&__kmp_debug_lock);
   __kmp_init_atomic_lock(&__kmp_atomic_lock);
   __kmp_init_atomic_lock(&__kmp_atomic_lock_1i);
   __kmp_init_atomic_lock(&__kmp_atomic_lock_2i);