[PATCH] Fix 78550 ICE with bit-field initialization

[Nathan Sidwell]

This patch fixes 78550, where we ICE in varasm as we discover a 
code-generating NOP_EXPR of an INTEGER_CST.  output_constructor 
(varasm.c) has a STRIP_NOPs, but that leaves the NOP alone, as it is 
truncating a regular QI mode operand to a 1 bit type.

That tree is generated in convert.c:
       /* If TYPE is an enumeral type or a type with a precision less
	 than the number of bits in its mode, do the conversion to the
	 type corresponding to its mode, then do a nop conversion
	 to TYPE.  */
....
	  return fold_build1_loc (dofold, loc, NOP_EXPR, type, ...);
	}
Fixed by changing it to maybe_fold_build1_loc.  Surrounding code uses 
that function.

ok?

nathan
-- 
Nathan Sidwell
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