HISTSEG: Count matching elements in vector segments

HISTSEG Zd.B, Zn.B, Zm.B (SVE2+NS

svuint8_t svhistseg[_s8](svint8_t op1, svint8_t op2)

svuint8_t svhistseg[_u8](svuint8_t op1, svuint8_t op2)

128-bit SVE

For each 8-bit element in (2), count the number of equal elements from (1) within the same 128-bit segment, and write the count to (3).

For each 8-bit element in (2), count the number of equal elements from (1) within the same 128-bit segment, and write the count to (3).

For each 8-bit element in (2), count the number of equal elements from (1) within the same 128-bit segment, and write the count to (3).

Larger sizes

For each 8-bit element in (2), count the number of equal elements from (1) within the same 128-bit segment, and write the count to (3).

For each 8-bit element in (2), count the number of equal elements from (1) within the same 128-bit segment, and write the count to (3).