Implement byte swapping instructions on MIPS32 and MIPS64.

test/cctest/test-disasm-mips64.cc

Index: test/cctest/test-disasm-mips64.cc
diff --git a/test/cctest/test-disasm-mips64.cc b/test/cctest/test-disasm-mips64.cc
index 7da601e01de63e53d910a8f346df55be64258938..dc6f34e462fcdbf6a0d80f4ac66a34a2180f7ec3 100644
--- a/test/cctest/test-disasm-mips64.cc
+++ b/test/cctest/test-disasm-mips64.cc
@@ -683,6 +683,26 @@ TEST(Type0) {
             "70621020       clz     v0, v1");
   }
 
+  COMPARE(seb(a0, a1), "7c052420       seb     a0, a1");
+  COMPARE(seb(s6, s7), "7c17b420       seb     s6, s7");
+  COMPARE(seb(v0, v1), "7c031420       seb     v0, v1");
+
+  COMPARE(seh(a0, a1), "7c052620       seh     a0, a1");
+  COMPARE(seh(s6, s7), "7c17b620       seh     s6, s7");
+  COMPARE(seh(v0, v1), "7c031620       seh     v0, v1");
+
+  COMPARE(wsbh(a0, a1), "7c0520a0       wsbh    a0, a1");
+  COMPARE(wsbh(s6, s7), "7c17b0a0       wsbh    s6, s7");
+  COMPARE(wsbh(v0, v1), "7c0310a0       wsbh    v0, v1");
+
+  COMPARE(dsbh(a0, a1), "7c0520a4       dsbh    a0, a1");
+  COMPARE(dsbh(s6, s7), "7c17b0a4       dsbh    s6, s7");
+  COMPARE(dsbh(v0, v1), "7c0310a4       dsbh    v0, v1");
+
+  COMPARE(dshd(a0, a1), "7c052164       dshd    a0, a1");
+  COMPARE(dshd(s6, s7), "7c17b164       dshd    s6, s7");
+  COMPARE(dshd(v0, v1), "7c031164       dshd    v0, v1");
+
   COMPARE(ins_(a0, a1, 31, 1),
           "7ca4ffc4       ins     a0, a1, 31, 1");
   COMPARE(ins_(s6, s7, 30, 2),