ART's intrinsic for String.indexOf use the incorrect register

ART's intrinsic for String.indexOf of x86 platform use the incorrect register
to compare start with the string length. It should be fixed.

Change-Id: I22986b4d4b23f62b4bb97baab9fe43152d12145e
Signed-off-by: Vladimir Ivanov <vladimir.a.ivanov@intel.com>
Signed-off-by: Yevgeny Rouban <yevgeny.y.rouban@intel.com>
diff --git a/compiler/dex/quick/x86/target_x86.cc b/compiler/dex/quick/x86/target_x86.cc
index 083fccb..3596fff 100644
--- a/compiler/dex/quick/x86/target_x86.cc
+++ b/compiler/dex/quick/x86/target_x86.cc
@@ -1028,7 +1028,7 @@
       } else {
         // Compare to memory to avoid a register load.  Handle pushed EDI.
         int displacement = SRegOffset(rl_start.s_reg_low) + sizeof(uint32_t);
-        OpRegMem(kOpCmp, rDX, rX86_SP, displacement);
+        OpRegMem(kOpCmp, rCX, rX86_SP, displacement);
         length_compare = NewLIR2(kX86Jcc8, 0, kX86CondLe);
         OpRegMem(kOpSub, rCX, rX86_SP, displacement);
       }