Add EXTRACTPS, PEXTRB, PEXTRW SSE4.1 support for x86

NEWS Entry
VEX/priv/guest_x86_toIR.c:  New decoder
none/tests/amd64/sse4-64.c:  Make test_PEXTRB(),
   test_PEXTRW(), test_EXTRACTPS() shared via
   one/tests/sse4-common.h
none/tests/sse4-common.h:  Ditto
none/tests/x86/sse4-x86.c:  Add testcase
none/tests/x86/sse4-x86.stdout.exp:  Ditto

https://bugs.kde.org/show_bug.cgi?id=523097