Remove profiling support.

This was used with an old LLVM pass to perform speculative inlining.  It
is no longer maintained and this code hasn't been tested at all for
years or with nontrivial examples ever.

sendmsg2.c

@@ -346,86 +346,6 @@ struct objc_slot_v1 *objc_slot_lookup_super(struct objc_super *super, SEL select
 	return &nil_slot_v1;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-// Profiling
-////////////////////////////////////////////////////////////////////////////////
-
-/**
- * Mutex used to protect non-thread-safe parts of the profiling subsystem.
- */
-static mutex_t profileLock;
-/**
- * File used for writing the profiling symbol table.
- */
-static FILE *profileSymbols;
-/**
- * File used for writing the profiling data.
- */
-static FILE *profileData;
-
-struct profile_info
-{
-	const char *module;
-	int32_t callsite;
-	IMP method;
-};
-
-static void profile_init(void)
-{
-	INIT_LOCK(profileLock);
-	profileSymbols = fopen("objc_profile.symbols", "a");
-	profileData = fopen("objc_profile.data", "a");
-	// Write markers indicating a new run.
-	fprintf(profileSymbols, "=== NEW TRACE ===\n");
-	struct profile_info profile_data = { 0, 0, 0 };
-	fwrite(&profile_data, sizeof(profile_data), 1, profileData);
-}
-
-void objc_profile_write_symbols(char **symbols)
-{
-	if (NULL == profileData)
-	{
-		LOCK_RUNTIME_FOR_SCOPE();
-		if (NULL == profileData)
-		{
-			profile_init();
-		}
-	}
-	LOCK(&profileLock);
-	while(*symbols)
-	{
-		char *address = *(symbols++);
-		char *symbol = *(symbols++);
-		fprintf(profileSymbols, "%zx %s\n", (size_t)address, symbol);
-	}
-	UNLOCK(&profileLock);
-	fflush(profileSymbols);
-}
-
-/**
- * Profiling version of the slot lookup.  This takes a unique ID for the module
- * and the callsite as extra arguments.  The type of the receiver and the
- * address of the resulting function are then logged to a file.  These can then
- * be used to determine whether adding slot caching is worthwhile, and whether
- * any of the resulting methods should be speculatively inlined.
- */
-void objc_msg_profile(id receiver, IMP method,
-                      const char *module, int32_t callsite)
-{
-	// Initialize the logging lazily.  This prevents us from wasting any memory
-	// when we are not profiling.
-	if (NULL == profileData)
-	{
-		LOCK_RUNTIME_FOR_SCOPE();
-		if (NULL == profileData)
-		{
-			profile_init();
-		}
-	}
-	struct profile_info profile_data = { module, callsite, method };
-	fwrite(&profile_data, sizeof(profile_data), 1, profileData);
-}
-
 /**
  * looks up a slot without invoking any forwarding mechanisms
  */