[Ada] Configuration state not observed for instance bodies

[Ada] Configuration state not observed for instance bodies

This patch ensures that the processing of instantiated and inlined bodies uses
the proper configuration context available at the point of the instantiation or
inlining.

Previously configuration pragmas which appear prior to the context items of a
unit would lose their effect when a body is instantiated or inlined.

2018-07-17  Hristian Kirtchev  <kirtchev@adacore.com>

gcc/ada/

	* frontend.adb (Frontend): Update the call to Register_Config_Switches.
	* inline.ads: Add new component Config_Switches to record
	Pending_Body_Info which captures the configuration state of the pending
	body.  Remove components Version, Version_Pragma, SPARK_Mode, and
	SPARK_Mode_Pragma from record Pending_Body_Info because they are
	already captured in component Config_Switches.
	* opt.adb (Register_Opt_Config_Switches): Rename to
	Register_Config_Switches.
	(Restore_Opt_Config_Switches): Rename to Restore_Config_Switches.
	(Save_Opt_Config_Switches): Rename to Save_Config_Switches. This
	routine is now a function, and returns the saved configuration state as
	an aggregate to avoid missing an attribute.
	(Set_Opt_Config_Switches): Rename to Set_Config_Switches.
	* opt.ads (Register_Opt_Config_Switches): Rename to
	Register_Config_Switches.
	(Restore_Opt_Config_Switches): Rename to Restore_Config_Switches.
	(Save_Opt_Config_Switches): Rename to Save_Config_Switches. This
	routine is now a function.
	(Set_Opt_Config_Switches): Rename to Set_Config_Switches.
	* par.adb (Par): Update the calls to configuration switch-related
	subprograms.
	* sem.adb (Semantics): Update the calls to configuration switch-related
	subprograms.
	* sem_ch10.adb (Analyze_Package_Body_Stub): Update the calls to
	configuration switch-related subprograms.
	(Analyze_Protected_Body_Stub): Update the calls to configuration
	switch-related subprograms.
	(Analyze_Subprogram_Body_Stub): Update calls to configuration
	switch-related subprograms.
	* sem_ch12.adb (Add_Pending_Instantiation): Update the capture of
	pending instantiation attributes.
	(Inline_Instance_Body): Update the capture of pending instantiation
	attributes.  It is no longer needed to explicitly manipulate the SPARK
	mode.
	(Instantiate_Package_Body): Update the restoration of the context
	attributes.
	(Instantiate_Subprogram_Body): Update the restoration of context
	attributes.
	(Load_Parent_Of_Generic): Update the capture of pending instantiation
	attributes.
	(Set_Instance_Env): Update the way relevant configuration attributes
	are saved and restored.

gcc/testsuite/

	* gnat.dg/config_pragma1.adb, gnat.dg/config_pragma1_pkg.ads: New testcase.

From-SVN: r262794