Add configure options.

Add:
  --with-lg-page
  --with-lg-page-sizes
  --with-lg-size-class-group
  --with-lg-quantum

Get rid of STATIC_PAGE_SHIFT, in favor of directly setting LG_PAGE.

Fix various edge conditions exposed by the configure options.

test/unit/lg_chunk.c

@@ -0,0 +1,26 @@
+#include "test/jemalloc_test.h"
+
+/*
+ * Make sure that opt.lg_chunk clamping is sufficient.  In practice, this test
+ * program will fail a debug assertion during initialization and abort (rather
+ * than the test soft-failing) if clamping is insufficient.
+ */
+const char *malloc_conf = "lg_chunk:0";
+
+TEST_BEGIN(test_lg_chunk_clamp)
+{
+	void *p;
+
+	p = mallocx(1, 0);
+	assert_ptr_not_null(p, "Unexpected mallocx() failure");
+	dallocx(p, 0);
+}
+TEST_END
+
+int
+main(void)
+{
+
+	return (test(
+		test_lg_chunk_clamp));
+}

test/unit/mallctl.c

@@ -357,7 +357,7 @@ TEST_BEGIN(test_arenas_lrun_constants)
 	assert_zu_eq(name, expected, "Incorrect "#name" size");		\
 } while (0)
 
-	TEST_ARENAS_LRUN_CONSTANT(size_t, size, (1 << (LG_PAGE+2)));
+	TEST_ARENAS_LRUN_CONSTANT(size_t, size, LARGE_MINCLASS);
 
 #undef TEST_ARENAS_LRUN_CONSTANT
 }