ada: Make pp and friends more robust

Print_Node_Ref, which is called by pp, sometimes calls
Compile_Time_Known_Value, which blows up if Entity (N)
is empty. Rearrange the tests here, and test for
Present (Entity (N)) before calling Compile_Time_Known_Value.
Remove test "Nkind (N) in N_Subexpr", which is redundant with other
tests.

We don't want to make Compile_Time_Known_Value more
robust; you shouldn't call it on half-baked nodes.
But ideally pp should be able to print such nodes.

This change fixes one of many such cases.

gcc/ada/ChangeLog:

	* treepr.adb (Print_Node_Ref): Protect against
	Entity (N) being empty before calling
	Compile_Time_Known_Value.

0 files changed, 0 insertions, 0 deletions