Match: Support form 3 for scalar signed integer .SAT_ADD

This patch would like to support the form 3 of the scalar signed
integer .SAT_ADD.  Aka below example:

Form 3:
  #define DEF_SAT_S_ADD_FMT_3(T, UT, MIN, MAX)           \
  T __attribute__((noinline))                            \
  sat_s_add_##T##_fmt_3 (T x, T y)                       \
  {                                                      \
    T sum;                                               \
    bool overflow = __builtin_add_overflow (x, y, &sum); \
    return overflow ? x < 0 ? MIN : MAX : sum;           \
  }

DEF_SAT_S_ADD_FMT_3(int8_t, uint8_t, INT8_MIN, INT8_MAX)

We can tell the difference before and after this patch if backend
implemented the ssadd<m>3 pattern similar as below.

Before this patch:
   4   │ __attribute__((noinline))
   5   │ int8_t sat_s_add_int8_t_fmt_3 (int8_t x, int8_t y)
   6   │ {
   7   │   signed char _1;
   8   │   signed char _2;
   9   │   int8_t _3;
  10   │   __complex__ signed char _6;
  11   │   _Bool _8;
  12   │   signed char _9;
  13   │   signed char _10;
  14   │   signed char _11;
  15   │
  16   │ ;;   basic block 2, loop depth 0
  17   │ ;;    pred:       ENTRY
  18   │   _6 = .ADD_OVERFLOW (x_4(D), y_5(D));
  19   │   _2 = IMAGPART_EXPR <_6>;
  20   │   if (_2 != 0)
  21   │     goto <bb 4>; [50.00%]
  22   │   else
  23   │     goto <bb 3>; [50.00%]
  24   │ ;;    succ:       4
  25   │ ;;                3
  26   │
  27   │ ;;   basic block 3, loop depth 0
  28   │ ;;    pred:       2
  29   │   _1 = REALPART_EXPR <_6>;
  30   │   goto <bb 5>; [100.00%]
  31   │ ;;    succ:       5
  32   │
  33   │ ;;   basic block 4, loop depth 0
  34   │ ;;    pred:       2
  35   │   _8 = x_4(D) < 0;
  36   │   _9 = (signed char) _8;
  37   │   _10 = -_9;
  38   │   _11 = _10 ^ 127;
  39   │ ;;    succ:       5
  40   │
  41   │ ;;   basic block 5, loop depth 0
  42   │ ;;    pred:       3
  43   │ ;;                4
  44   │   # _3 = PHI <_1(3), _11(4)>
  45   │   return _3;
  46   │ ;;    succ:       EXIT
  47   │
  48   │ }

After this patch:
   4   │ __attribute__((noinline))
   5   │ int8_t sat_s_add_int8_t_fmt_3 (int8_t x, int8_t y)
   6   │ {
   7   │   int8_t _3;
   8   │
   9   │ ;;   basic block 2, loop depth 0
  10   │ ;;    pred:       ENTRY
  11   │   _3 = .SAT_ADD (x_4(D), y_5(D)); [tail call]
  12   │   return _3;
  13   │ ;;    succ:       EXIT
  14   │
  15   │ }

The below test suites are passed for this patch.
* The rv64gcv fully regression test.
* The x86 bootstrap test.
* The x86 fully regression test.

gcc/ChangeLog:

	* match.pd: Add the form 3 of signed .SAT_ADD matching.

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

gcc/match.pd

@@ -3241,6 +3241,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
 	@2)
  (if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type))))
 
+/* Signed saturation add, case 4:
+   Z = .ADD_OVERFLOW (X, Y)
+   SAT_S_ADD = IMAGPART_EXPR (Z) != 0 ? (-(T)(X < 0) ^ MAX) : sum;  */
+(match (signed_integer_sat_add @0 @1)
+ (cond^ (ne (imagpart (IFN_ADD_OVERFLOW:c@2 @0 @1)) integer_zerop)
+	(bit_xor:c (negate (convert (lt @0 integer_zerop))) max_value)
+	(realpart @2))
+ (if (INTEGRAL_TYPE_P (type) && !TYPE_UNSIGNED (type)
+      && types_match (type, @0, @1))))
+
 /* Unsigned saturation sub, case 1 (branch with gt):
    SAT_U_SUB = X > Y ? X - Y : 0  */
 (match (unsigned_integer_sat_sub @0 @1)