[Ada] Spurious error on qualified prefix in Pack.Func'Result

[Ada] Spurious error on qualified prefix in Pack.Func'Result

[Pierre-Marie de Rodat]

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When using a qualified name such as Pack.Func as the prefix of a 'Result
attribute reference, the prefix is not fully resolved and may contain a
chain of homonyms. Look for the expected function in the homonym chain
instead of issuing an error if the first one is not the expected one.

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

gcc/ada/

	* sem_attr.adb (Analyze_Attribute): Take into account the
	possibility of homonyms.

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diff --git a/gcc/ada/sem_attr.adb b/gcc/ada/sem_attr.adb
--- a/gcc/ada/sem_attr.adb
+++ b/gcc/ada/sem_attr.adb
@@ -5835,6 +5835,12 @@ package body Sem_Attr is
 
             elsif Present (Over_Id) and then Pref_Id = Over_Id then
                return True;
+
+            --  When a qualified name is used for the prefix, homonyms may come
+            --  before the current function in the homonym chain.
+
+            elsif Has_Homonym (Pref_Id) then
+               return Denote_Same_Function (Homonym (Pref_Id), Spec_Id);
             end if;
 
             --  Otherwise the prefix does not denote the related subprogram