Break prof_accum into multiple compilation units.

Break prof_accum into multiple compilation units, in order to thwart
compiler optimizations such as inlining and tail call optimization that
would alter backtraces.

test/unit/prof_accum.h

@@ -0,0 +1,29 @@
+#include "test/jemalloc_test.h"
+
+#define	NTHREADS		4
+#define	NALLOCS_PER_THREAD	50
+#define	DUMP_INTERVAL		1
+#define	BT_COUNT_CHECK_INTERVAL	5
+
+#define	alloc_n_proto(n)						\
+void	*alloc_##n(unsigned bits);
+alloc_n_proto(0)
+alloc_n_proto(1)
+
+#define	alloc_n_gen(n)							\
+void *									\
+alloc_##n(unsigned bits)						\
+{									\
+									\
+	if (bits == 0) {						\
+		void *p = mallocx(1, 0);				\
+		assert_ptr_not_null(p, "Unexpected mallocx() failure");	\
+		return (p);						\
+	} else {							\
+		switch (bits & 0x1U) {					\
+		case 0: return (alloc_0(bits >> 1));			\
+		case 1: return (alloc_1(bits >> 1));			\
+		default: not_reached();					\
+		}							\
+	}								\
+}