Fix disassembly of sar(_, imm8)

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/442003002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ia32/disasm-ia32.cc

@@ -606,7 +606,7 @@ int DisassemblerIA32::D1D3C1Instruction(byte* data) {
   if (op == 0xD1) {
     imm8 = 1;
   } else if (op == 0xC1) {
-    imm8 = *(data + 2);
+    imm8 = *(data + 1);
     count++;
   } else if (op == 0xD3) {
     // Shift/rotate by cl.

src/x87/disasm-x87.cc

@@ -606,7 +606,7 @@ int DisassemblerX87::D1D3C1Instruction(byte* data) {
   if (op == 0xD1) {
     imm8 = 1;
   } else if (op == 0xC1) {
-    imm8 = *(data + 2);
+    imm8 = *(data + 1);
     count++;
   } else if (op == 0xD3) {
     // Shift/rotate by cl.