[committed] Fix Ada bootstrap

[Andrew Pinski]

The problem here is that we use fields on CONST_DECLs which have no
meaning and now we check for this.
This fixes by checking before trying to set those fields.

Committed as pre-approved by Geert Bosch on IRC.

Thanks,
Andrew Pinski

ada/ChangeLog:
	* utils.c (create_var_decl): Only set DECL_COMMON on
	VAR_DECLs. Only set SET_DECL_ASSEMBLER_NAME on
	VAR_OR_FUNCTION_DECL_P.


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