Remove unused field from pthread struct. NFC (#26900)

Split out from #26857.

Author: kleisauke

src/struct_info_generated.json

@@ -1040,11 +1040,11 @@
             "p_proto": 8
         },
         "pthread": {
-            "__size__": 124,
-            "profilerBlock": 100,
+            "__size__": 120,
+            "profilerBlock": 96,
             "stack": 48,
             "stack_size": 52,
-            "waiting_async": 116
+            "waiting_async": 112
         },
         "pthread_attr_t": {
             "__size__": 44,

system/lib/libc/musl/src/internal/pthread_impl.h

@@ -69,8 +69,9 @@ struct pthread {
 #ifndef __EMSCRIPTEN__
 	// Emscripten uses C11 _Thread_local instead for locale
 	locale_t locale;
-#endif
+	// Emscripten doesn't use this field.
 	volatile int killlock[1];
+#endif
 	char *dlerror_buf;
 	void *stdio_locks;
 

test/codesize/test_codesize_cxx_ctors1.json

@@ -2,9 +2,9 @@
   "a.out.js": 19260,
   "a.out.js.gz": 7991,
   "a.out.nodebug.wasm": 132627,
-  "a.out.nodebug.wasm.gz": 49919,
+  "a.out.nodebug.wasm.gz": 49918,
   "total": 151887,
-  "total_gz": 57910,
+  "total_gz": 57909,
   "sent": [
     "__cxa_throw",
     "_abort_js",

test/codesize/test_codesize_cxx_except_wasm.json

@@ -2,9 +2,9 @@
   "a.out.js": 19092,
   "a.out.js.gz": 7925,
   "a.out.nodebug.wasm": 147926,
-  "a.out.nodebug.wasm.gz": 55308,
+  "a.out.nodebug.wasm.gz": 55309,
   "total": 167018,
-  "total_gz": 63233,
+  "total_gz": 63234,
   "sent": [
     "_abort_js",
     "_tzset_js",

test/codesize/test_codesize_cxx_except_wasm_legacy.json

@@ -2,9 +2,9 @@
   "a.out.js": 19166,
   "a.out.js.gz": 7949,
   "a.out.nodebug.wasm": 145732,
-  "a.out.nodebug.wasm.gz": 54936,
+  "a.out.nodebug.wasm.gz": 54935,
   "total": 164898,
-  "total_gz": 62885,
+  "total_gz": 62884,
   "sent": [
     "_abort_js",
     "_tzset_js",

test/codesize/test_codesize_cxx_noexcept.json

@@ -2,9 +2,9 @@
   "a.out.js": 19260,
   "a.out.js.gz": 7991,
   "a.out.nodebug.wasm": 134657,
-  "a.out.nodebug.wasm.gz": 50774,
+  "a.out.nodebug.wasm.gz": 50773,
   "total": 153917,
-  "total_gz": 58765,
+  "total_gz": 58764,
   "sent": [
     "__cxa_throw",
     "_abort_js",

test/codesize/test_codesize_hello_dylink.json

@@ -2,9 +2,9 @@
   "a.out.js": 26251,
   "a.out.js.gz": 11195,
   "a.out.nodebug.wasm": 17671,
-  "a.out.nodebug.wasm.gz": 8920,
+  "a.out.nodebug.wasm.gz": 8921,
   "total": 43922,
-  "total_gz": 20115,
+  "total_gz": 20116,
   "sent": [
     "__syscall_stat64",
     "emscripten_resize_heap",

test/codesize/test_codesize_minimal_pthreads.json

@@ -1,8 +1,8 @@
 {
   "a.out.js": 7372,
-  "a.out.js.gz": 3594,
+  "a.out.js.gz": 3593,
   "a.out.nodebug.wasm": 19047,
-  "a.out.nodebug.wasm.gz": 8795,
+  "a.out.nodebug.wasm.gz": 8796,
   "total": 26419,
   "total_gz": 12389,
   "sent": [

test/codesize/test_codesize_minimal_pthreads_memgrowth.json

@@ -2,9 +2,9 @@
   "a.out.js": 7781,
   "a.out.js.gz": 3797,
   "a.out.nodebug.wasm": 19048,
-  "a.out.nodebug.wasm.gz": 8796,
+  "a.out.nodebug.wasm.gz": 8797,
   "total": 26829,
-  "total_gz": 12593,
+  "total_gz": 12594,
   "sent": [
     "a (memory)",
     "b (exit)",