This patch fixes a bug in the node/entity kinds that are generated by
Gen_IL in sinfo/einfo.h. These numbers should be the same as the 'Pos of
the corresponding enumeration literals in Node_Kind and Entity_Kind.

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

gcc/ada/

	* gen_il-gen.adb (Put_C_Type_And_Subtypes): Put the correct
	numbers.
	* gen_il-internals.ads, gen_il-internals.adb: (Pos): Remove this
	function. It was assuming that the order of the enumeration
	literals in Type_Enum is the same as the order of the generated
	types Node_Kind and Entity_Kind, which is not true.