fix a potential issue of SEL IR optimization when subphysical is true
fix a potential issue of SEL IR optimization when subphysical is true

here is an example:
 mov %10, %9.0
 mov %11, %9.1
 ...
 mov %9, %8

both %9.0 and %9.1 are collected into replacement in the ReplaceInfoMap
after the first two insts are scanned. When scan the last inst that %9
is overwritten, we should flag both %9.0 and %9.1 in the map.

Signed-off-by: Guo Yejun <1f883e24fa2949df61a83c432caa290810cece11@intel.com>
Reviewed-by: Ruiling Song <286a174c1339c6eff91abc41c3a1012c95030c95@intel.com>

wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet