ada: Keep source locations for inlined subprograms from predefined units

ada: Keep source locations for inlined subprograms from predefined units

Frontend inlining, which is now deprecated and only enabled with switch -gnatN
is used, used to reset source locations for subprograms from predefined units.
This was a workaround to prevent the debugger from visiting internal code in
Ada.Tags, but this problem no longer occurs (even when switch -gnatN is used)
and is no longer needed. This patch removes it, because it confused
compile-time evaluation, which makes use of source locations to recognize code
within IF statements.

gcc/ada/ChangeLog:

	* inline.adb (Process_Sloc): Remove.