tcg: Add INDEX_op_extract2_{i32,i64}

This will let backends implement the double-word shift operation.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/tcg/s390/tcg-target.h b/tcg/s390/tcg-target.h
index 853ed6e..07accab 100644
--- a/tcg/s390/tcg-target.h
+++ b/tcg/s390/tcg-target.h
@@ -85,6 +85,7 @@
 #define TCG_TARGET_HAS_deposit_i32    (s390_facilities & FACILITY_GEN_INST_EXT)
 #define TCG_TARGET_HAS_extract_i32    (s390_facilities & FACILITY_GEN_INST_EXT)
 #define TCG_TARGET_HAS_sextract_i32   0
+#define TCG_TARGET_HAS_extract2_i32   0
 #define TCG_TARGET_HAS_movcond_i32    1
 #define TCG_TARGET_HAS_add2_i32       1
 #define TCG_TARGET_HAS_sub2_i32       1
@@ -121,6 +122,7 @@
 #define TCG_TARGET_HAS_deposit_i64    (s390_facilities & FACILITY_GEN_INST_EXT)
 #define TCG_TARGET_HAS_extract_i64    (s390_facilities & FACILITY_GEN_INST_EXT)
 #define TCG_TARGET_HAS_sextract_i64   0
+#define TCG_TARGET_HAS_extract2_i64   0
 #define TCG_TARGET_HAS_movcond_i64    1
 #define TCG_TARGET_HAS_add2_i64       1
 #define TCG_TARGET_HAS_sub2_i64       1