Remove redundant { dg-do run } directives in tests

Remove redundant { dg-do run } directives in tests

These tests accidentally had two dg-do directives. Only the second one
is needed.

	* testsuite/26_numerics/bit/bitops.count/countl_one.cc: Remove
	redundant dg-do directive.
	* testsuite/26_numerics/bit/bitops.count/countl_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_one.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/countr_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bitops.count/popcount.cc: Likewise.

From-SVN: r263695