Fix the Thumb-2 definition of the CLREX instruction.

Test: make test-art-host-gtest-assembler_thumb2_test
Change-Id: I433fa35451aa944e300d5d582dc16b2b9a8bcfb3
diff --git a/compiler/utils/arm/assembler_thumb2.cc b/compiler/utils/arm/assembler_thumb2.cc
index 61b7f08..1e71d06 100644
--- a/compiler/utils/arm/assembler_thumb2.cc
+++ b/compiler/utils/arm/assembler_thumb2.cc
@@ -2830,7 +2830,7 @@
 
 void Thumb2Assembler::clrex(Condition cond) {
   CheckCondition(cond);
-  int32_t encoding = B31 | B30 | B29 | B27 | B28 | B25 | B24 | B23 |
+  int32_t encoding = B31 | B30 | B29 | B28 | B25 | B24 | B23 |
       B21 | B20 |
       0xf << 16 |
       B15 |