OpenMP: Support complex/float in && and || reduction

C/C++ permit logical AND and logical OR also with floating-point or complex
arguments by doing an unequal zero comparison; the result is an 'int' with
value one or zero.  Hence, those are also permitted as reduction variable,
even though it is not the most sensible thing to do.

gcc/c/ChangeLog:

	* c-typeck.c (c_finish_omp_clauses): Accept float + complex
	for || and && reductions.

gcc/cp/ChangeLog:

	* semantics.c (finish_omp_reduction_clause): Accept float + complex
	for || and && reductions.

gcc/ChangeLog:

	* omp-low.c (lower_rec_input_clauses, lower_reduction_clauses): Handle
	&& and || with floating-point and complex arguments.

gcc/testsuite/ChangeLog:

	* gcc.dg/gomp/clause-1.c: Use 'reduction(&:..)' instead of '...(&&:..)'.

libgomp/ChangeLog:

	* testsuite/libgomp.c-c++-common/reduction-1.c: New test.
	* testsuite/libgomp.c-c++-common/reduction-2.c: New test.
	* testsuite/libgomp.c-c++-common/reduction-3.c: New test.