[Ada] Disable wrong computation of offsets within multidimensional arrays

Pierre-Marie de Rodat derodat@adacore.com
Mon Jun 21 11:05:33 GMT 2021

Routine Indexed_Component_Bit_Offset is meant to return the first bit
position of an array component, but it only examined the first index
expression and necessarily produced wrong results for multidimensional

Since this routine is only used for warnings, it is safe to simply
disable this wrong code and behave just like if the offsets within
a multidimensional array would not be known at compile time.

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


	* sem_util.adb (Indexed_Component_Bit_Offset): Return an unknown
	offset for components within multidimensional arrays; remove
	redundant parens.
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