re PR preprocessor/63831 (r217292 causes segfaults with -MM)

PR preprocessor/63831
	* c-cppbuiltin.c (c_cpp_builtins): Don't define __has_attribute
	and __has_cpp_attribute here.
	* c-ppoutput.c (init_pp_output): Set cb->has_attribute to
	c_common_has_attribute.
	* c-common.h (c_common_has_attribute): New prototype.
	* c-lex.c (init_c_lex): Set cb->has_attribute to
	c_common_has_attribute instead of cb_has_attribute.
	(get_token_no_padding): New function.
	(cb_has_attribute): Renamed to ...
	(c_common_has_attribute): ... this.  No longer static.  Use
	get_token_no_padding, require ()s, don't build TREE_LIST
	unnecessarily, fix up formatting, adjust diagnostics, call
	init_attributes.

	* directives.c (lex_macro_node): Remove __has_attribute__ handling.
	* internal.h (struct spec_node): Remove n__has_attribute__ field.
	(struct lexer_state): Remove in__has_attribute__ field.
	* macro.c (_cpp_builtin_macro_text): Handle BT_HAS_ATTRIBUTE.
	* identifiers.c (_cpp_init_hashtable): Remove __has_attribute__
	handling.
	* init.c (builtin_array): Add __has_attribute and __has_cpp_attribute.
	(cpp_init_special_builtins): Don't initialize __has_attribute
	or __has_cpp_attribute if CLK_ASM or pfile->cb.has_attribute is NULL.
	* traditional.c (enum ls): Remove ls_has_attribute,
	ls_has_attribute_close.
	(_cpp_scan_out_logical_line): Remove __has_attribute__ handling.
	* include/cpplib.h (enum cpp_builtin_type): Add BT_HAS_ATTRIBUTE.
	* pch.c (cpp_read_state): Remove __has_attribute__ handling.
	* expr.c (eval_token): Likewise.
	(parse_has_attribute): Removed.

	* c-c++-common/cpp/pr63831-1.c: New test.
	* c-c++-common/cpp/pr63831-2.c: New test.

From-SVN: r218948

libcpp/include/cpplib.h

@@ -676,6 +676,7 @@ enum cpp_builtin_type
   BT_PRAGMA,			/* `_Pragma' operator */
   BT_TIMESTAMP,			/* `__TIMESTAMP__' */
   BT_COUNTER,			/* `__COUNTER__' */
+  BT_HAS_ATTRIBUTE,		/* `__has_attribute__(x)' */
   BT_FIRST_USER,		/* User defined builtin macros.  */
   BT_LAST_USER = BT_FIRST_USER + 31
 };