Streamline tcache-related malloc/free fast paths.

tcache_get() is inlined, so do the config_tcache check inside
tcache_get() and simplify its callers.

Make arena_malloc() an inline function, since it is part of the malloc()
fast path.

Remove conditional logic that cause build issues if --disable-tcache was
specified.

src/arena.c

@@ -1455,35 +1455,6 @@ arena_malloc_large(arena_t *arena, size_t size, bool zero)
 	return (ret);
 }
 
-void *
-arena_malloc(size_t size, bool zero)
-{
-
-	assert(size != 0);
-	assert(QUANTUM_CEILING(size) <= arena_maxclass);
-
-	if (size <= small_maxclass) {
-		tcache_t *tcache;
-
-		if (config_tcache && (tcache = tcache_get()) != NULL)
-			return (tcache_alloc_small(tcache, size, zero));
-		else
-			return (arena_malloc_small(choose_arena(), size, zero));
-	} else {
-		if (config_tcache && size <= tcache_maxclass) {
-			tcache_t *tcache;
-
-			if ((tcache = tcache_get()) != NULL)
-				return (tcache_alloc_large(tcache, size, zero));
-			else {
-				return (arena_malloc_large(choose_arena(),
-				    size, zero));
-			}
-		} else
-			return (arena_malloc_large(choose_arena(), size, zero));
-	}
-}
-
 /* Only handles large allocations that require more than page alignment. */
 void *
 arena_palloc(arena_t *arena, size_t size, size_t alloc_size, size_t alignment,

src/tcache.c

@@ -1,6 +1,6 @@
 #define	JEMALLOC_TCACHE_C_
 #include "jemalloc/internal/jemalloc_internal.h"
-#ifdef JEMALLOC_TCACHE
+
 /******************************************************************************/
 /* Data. */
 
@@ -436,5 +436,3 @@ tcache_boot(void)
 
 	return (false);
 }
-/******************************************************************************/
-#endif /* JEMALLOC_TCACHE */