ldexp, ldexpf, ldexpl: Enhance tests. * tests/test-ldexp.h: New file, combining code from tests/test-ldexp.c and tests/test-ldexpl.c. * tests/test-ldexpl.c: (DOUBLE, ISNAN, INFINITY, NAN, L_, MINUS_ZERO, LDEXP, MIN_EXP, MAX_EXP): New macros. Include test-ldexp.h. (main): Just call test_function. * tests/test-ldexp.c: Include float.h, isnand-nolibm.h, minus-zero.h, infinity.h, nan.h. (DOUBLE, ISNAN, INFINITY, NAN, L_, MINUS_ZERO, LDEXP, MIN_EXP, MAX_EXP): New macros. Include test-ldexp.h. (x, y): Remove variables. (main): Just call test_function. * tests/test-ldexpf.c: Include float.h, isnanf-nolibm.h, minus-zero.h, infinity.h, nan.h. (DOUBLE, ISNAN, INFINITY, NAN, L_, MINUS_ZERO, LDEXP, MIN_EXP, MAX_EXP): New macros. Include test-ldexp.h. (x, y): Remove variables. (main): Just call test_function. * modules/ldexpl-tests (Files): Add tests/test-ldexp.h. * modules/ldexp-tests (Files): Add tests/test-ldexp.h, tests/minus-zero.h, tests/infinity.h, tests/nan.h. (Depends-on): Add isnand-nolibm, signbit, float. * modules/ldexpf-tests (Files): Add tests/test-ldexp.h, tests/minus-zero.h, tests/infinity.h, tests/nan.h. (Depends-on): Add isnanf-nolibm, signbit, float.