wrong GIMPLE from (bit_field_ref CTOR ..) simplification

When we simplify a BIT_FIELD_REF of a CTOR like { _1, _2, _3, _4 }
and attempt to produce (view converted) { _1, _2 } for a selected
subset we fail to realize this cannot be done from match.pd since
we have no way to write the resulting CTOR "operation" and the
built CTOR { _1, _2 } isn't a GIMPLE value.

This kind of simplifications have to be done in forwprop (or would
need a match.pd syntax extension) where we can split out the CTOR
to a separate stmt.

The following disables this particular simplification when we are
simplifying GIMPLE.  With enhanced IL checking this otherwise
causes ICEs in the testsuite from vectorized code.

	* match.pd (BIT_FIELD_REF CONSTRUCTOR@0 @1 @2): Do not
	create a CTOR operand in the result when simplifying GIMPLE.

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