Add support for the deprecated attribute

This is useful for enforcing the usage of getter/setter functions to
access fields which are considered private or have unique access constraints.

include/jemalloc/internal/jemalloc_internal_macros.h

@@ -53,6 +53,7 @@
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_FRAME_ADDRESS
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_TYPE_LIMITS
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_ALLOC_SIZE_LARGER_THAN
+#  define JEMALLOC_DIAGNOSTIC_IGNORE_DEPRECATED
 #  define JEMALLOC_DIAGNOSTIC_DISABLE_SPURIOUS
 /* #pragma GCC diagnostic first appeared in gcc 4.6. */
 #elif (defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && \
@@ -92,6 +93,12 @@
 #  else
 #    define JEMALLOC_DIAGNOSTIC_IGNORE_ALLOC_SIZE_LARGER_THAN
 #  endif
+#  ifdef JEMALLOC_HAVE_ATTR_DEPRECATED
+#    define JEMALLOC_DIAGNOSTIC_IGNORE_DEPRECATED \
+       JEMALLOC_DIAGNOSTIC_IGNORE("-Wdeprecated-declarations")
+#  else
+#    define JEMALLOC_DIAGNOSTIC_IGNORE_DEPRECATED
+#  endif
 #  define JEMALLOC_DIAGNOSTIC_DISABLE_SPURIOUS \
   JEMALLOC_DIAGNOSTIC_PUSH \
   JEMALLOC_DIAGNOSTIC_IGNORE_UNUSED_PARAMETER
@@ -103,9 +110,16 @@
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_FRAME_ADDRESS
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_TYPE_LIMITS
 #  define JEMALLOC_DIAGNOSTIC_IGNORE_ALLOC_SIZE_LARGER_THAN
+#  define JEMALLOC_DIAGNOSTIC_IGNORE_DEPRECATED
 #  define JEMALLOC_DIAGNOSTIC_DISABLE_SPURIOUS
 #endif
 
+#define JEMALLOC_SUPPRESS_WARN_ON_USAGE(...) \
+   JEMALLOC_DIAGNOSTIC_PUSH \
+   JEMALLOC_DIAGNOSTIC_IGNORE_DEPRECATED \
+   __VA_ARGS__ \
+   JEMALLOC_DIAGNOSTIC_POP
+
 /*
  * Disables spurious diagnostics for all headers.  Since these headers are not
  * included by users directly, it does not affect their diagnostic settings.