Fix for incorrect parse of PEXTRW instruction

The instruction PEXTRW encoded by sequence 66 0F C5 has form:
PEXTRW reg, xmm, imm8. Its reg is encoded in the REG part and
xmm is encoded in the R/M part of ModR/M byte. Since the order
is opposite to the PEXTRB and PEXTRD, we have to set 'load' to
true and 'store' leave as false.

Change-Id: I32c42ea005eec29f7bf969f275c36ffa0a95fa6d
diff --git a/disassembler/disassembler_x86.cc b/disassembler/disassembler_x86.cc
index a1834e1..ba0c0bd 100644
--- a/disassembler/disassembler_x86.cc
+++ b/disassembler/disassembler_x86.cc
@@ -942,7 +942,7 @@
           opcode1 = "pextrw";
           prefix[2] = 0;
           has_modrm = true;
-          store = true;
+          load = true;
           src_reg_file = SSE;
           immediate_bytes = 1;
         } else {