ada: Use Inline aspect instead of pragma in Einfo.Utils

ada: Use Inline aspect instead of pragma in Einfo.Utils

This package was using the Ada 83 renaming idiom for inlining
Next_Component and other Next_... procedures without inlining the
same-named functions. Using the Inline aspect avoids that sort
of horsing around.

We change all the other pragmas Inline in this package to aspects
as well, which is a more-minor improvement. Fix too-long lines
without wrapping lines.

gcc/ada/

	* einfo-utils.ads, einfo-utils.adb: Get rid of the Proc_Next_...
	procedures. Use Inline aspect instead of pragma Inline.
	Is_Discrete_Or_Fixed_Point_Type did not have pragma Inline, but
	now has the aspect; this was probably an oversight
	(which illustrates why aspects are better).