d: Match function declarations of gcc built-ins from any module.

Declarations of recognised gcc built-in functions are now matched from
any module.  Previously, only the `core.stdc' package was scanned.

In addition to matching of the symbol, any user-applied `@attributes' or
`pragma(mangle)' name will be applied to the built-in decl as well.
Because there would now be no control over where built-in declarations
are coming from, the warning option `-Wbuiltin-declaration-mismatch' has
been implemented in the D front-end too.

gcc/d/ChangeLog:

	* d-builtins.cc: Include builtins.h.
	(gcc_builtins_libfuncs): Remove.
	(strip_type_modifiers): New function.
	(matches_builtin_type): New function.
	(covariant_with_builtin_type_p): New function.
	(maybe_set_builtin_1): Set front-end built-in if identifier matches
	gcc built-in name.  Apply user-specified attributes and assembler name
	overrides to the built-in.  Warn about built-in declaration mismatches.
	(d_builtin_function): Set IDENTIFIER_DECL_TREE of built-in functions.
	* d-compiler.cc (Compiler::onParseModule): Scan all modules for any
	identifiers that match built-in function names.
	* lang.opt (Wbuiltin-declaration-mismatch): New option.

gcc/testsuite/ChangeLog:

	* gdc.dg/Wbuiltin_declaration_mismatch.d: New test.
	* gdc.dg/builtins.d: New test.

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