[Ada] Small enhancement in XEinfo utility

[Pierre-Marie de Rodat]

This extends the set of return expressions that can be read by the
XEinfo utility in order to generate the C header file einfo.h and
updates the spec accordingly.

No functional changes.

Tested on x86_64-pc-linux-gnu, committed on trunk

2020-06-09  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* einfo.ads (XEINFO section): Update format description.
	(Is_Subprogram_Or_Entry): Move pragma to regular section.
	(Is_Subprogram_Or_Generic_Subprogram): Likewise.
	* xeinfo.adb (Get_B4): Rename to...
	(Get_B0): ...this.
	(Translate_Expr): New procedure extracted from...
	(XEinfo): ...here.  Try to apply Get_B0 first and then
	call Translate_Expr to translate supported constructs.
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