Match: Support forms 7 and 8 for the unsigned .SAT_ADD

When investigate the vectorization of .SAT_ADD,  we notice there
are additional 2 forms,  aka form 7 and 8 for .SAT_ADD.

Form 7:
  #define DEF_SAT_U_ADD_FMT_7(T)          \
  T __attribute__((noinline))             \
  sat_u_add_##T##_fmt_7 (T x, T y)        \
  {                                       \
    return x > (T)(x + y) ? -1 : (x + y); \
  }

Form 8:
  #define DEF_SAT_U_ADD_FMT_8(T)           \
  T __attribute__((noinline))              \
  sat_u_add_##T##_fmt_8 (T x, T y)         \
  {                                        \
    return x <= (T)(x + y) ? (x + y) : -1; \
  }

Thus,  add above 2 forms to the match gimple_unsigned_integer_sat_add,
and then the vectorizer can try to recog the pattern like form 7 and
form 8.

The below test suites are passed for this patch:
1. The rv64gcv fully regression test with newlib.
2. The rv64gcv build with glibc.
3. The x86 bootstrap test.
4. The x86 fully regression test.

gcc/ChangeLog:

	* match.pd: Add form 7 and 8 for the unsigned .SAT_ADD match.

Signed-off-by: Pan Li <pan2.li@intel.com>

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