Refactor to support more varied testing.

Refactor the test harness to support three types of tests:
- unit: White box unit tests.  These tests have full access to all
  internal jemalloc library symbols.  Though in actuality all symbols
  are prefixed by jet_, macro-based name mangling abstracts this away
  from test code.
- integration: Black box integration tests.  These tests link with
  the installable shared jemalloc library, and with the exception of
  some utility code and configure-generated macro definitions, they have
  no access to jemalloc internals.
- stress: Black box stress tests.  These tests link with the installable
  shared jemalloc library, as well as with an internal allocator with
  symbols prefixed by jet_ (same as for unit tests) that can be used to
  allocate data structures that are internal to the test code.

Move existing tests into test/{unit,integration}/ as appropriate.

Split out internal parts of jemalloc_defs.h.in and put them in
jemalloc_internal_defs.h.in.  This reduces internals exposure to
applications that #include <jemalloc/jemalloc.h>.

Refactor jemalloc.h header generation so that a single header file
results, and the prototypes can be used to generate jet_ prototypes for
tests.  Split jemalloc.h.in into multiple parts (jemalloc_defs.h.in,
jemalloc_macros.h.in, jemalloc_protos.h.in, jemalloc_mangle.h.in) and
use a shell script to generate a unified jemalloc.h at configure time.

Change the default private namespace prefix from "" to "je_".

Add missing private namespace mangling.

Remove hard-coded private_namespace.h.  Instead generate it and
private_unnamespace.h from private_symbols.txt.  Use similar logic for
public symbols, which aids in name mangling for jet_ symbols.

Add test_warn() and test_fail().  Replace existing exit(1) calls with
test_fail() calls.

test/integration/allocated.c

@@ -0,0 +1,111 @@
+#include "test/jemalloc_test.h"
+
+void *
+je_thread_start(void *arg)
+{
+	int err;
+	void *p;
+	uint64_t a0, a1, d0, d1;
+	uint64_t *ap0, *ap1, *dp0, *dp1;
+	size_t sz, usize;
+
+	sz = sizeof(a0);
+	if ((err = mallctl("thread.allocated", &a0, &sz, NULL, 0))) {
+		if (err == ENOENT) {
+#ifdef JEMALLOC_STATS
+			assert(false);
+#endif
+			goto label_return;
+		}
+		test_fail("%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+	}
+	sz = sizeof(ap0);
+	if ((err = mallctl("thread.allocatedp", &ap0, &sz, NULL, 0))) {
+		if (err == ENOENT) {
+#ifdef JEMALLOC_STATS
+			assert(false);
+#endif
+			goto label_return;
+		}
+		test_fail("%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+	}
+	assert(*ap0 == a0);
+
+	sz = sizeof(d0);
+	if ((err = mallctl("thread.deallocated", &d0, &sz, NULL, 0))) {
+		if (err == ENOENT) {
+#ifdef JEMALLOC_STATS
+			assert(false);
+#endif
+			goto label_return;
+		}
+		test_fail("%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+	}
+	sz = sizeof(dp0);
+	if ((err = mallctl("thread.deallocatedp", &dp0, &sz, NULL, 0))) {
+		if (err == ENOENT) {
+#ifdef JEMALLOC_STATS
+			assert(false);
+#endif
+			goto label_return;
+		}
+		test_fail("%s(): Error in mallctl(): %s\n", __func__,
+		    strerror(err));
+	}
+	assert(*dp0 == d0);
+
+	p = malloc(1);
+	if (p == NULL)
+		test_fail("%s(): Error in malloc()\n", __func__);
+
+	sz = sizeof(a1);
+	mallctl("thread.allocated", &a1, &sz, NULL, 0);
+	sz = sizeof(ap1);
+	mallctl("thread.allocatedp", &ap1, &sz, NULL, 0);
+	assert(*ap1 == a1);
+	assert(ap0 == ap1);
+
+	usize = malloc_usable_size(p);
+	assert(a0 + usize <= a1);
+
+	free(p);
+
+	sz = sizeof(d1);
+	mallctl("thread.deallocated", &d1, &sz, NULL, 0);
+	sz = sizeof(dp1);
+	mallctl("thread.deallocatedp", &dp1, &sz, NULL, 0);
+	assert(*dp1 == d1);
+	assert(dp0 == dp1);
+
+	assert(d0 + usize <= d1);
+
+label_return:
+	return (NULL);
+}
+
+int
+main(void)
+{
+	int ret = 0;
+	je_thread_t thread;
+
+	malloc_printf("Test begin\n");
+
+	je_thread_start(NULL);
+
+	je_thread_create(&thread, je_thread_start, NULL);
+	je_thread_join(thread, NULL);
+
+	je_thread_start(NULL);
+
+	je_thread_create(&thread, je_thread_start, NULL);
+	je_thread_join(thread, NULL);
+
+	je_thread_start(NULL);
+
+	malloc_printf("Test end\n");
+	return (ret);
+}