Fix the encoding and parsing of clrex instruction

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123936 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index ee6ef2b..b388dce 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -1194,7 +1194,8 @@
       Mnemonic == "cps" || Mnemonic == "mcr2" || Mnemonic == "it" ||
       Mnemonic == "mcrr2" || Mnemonic == "cbz" || Mnemonic == "cdp2" ||
       Mnemonic == "trap" || Mnemonic == "mrc2" || Mnemonic == "mrrc2" ||
-      Mnemonic == "dsb" || Mnemonic == "movs" || Mnemonic == "isb") {
+      Mnemonic == "dsb" || Mnemonic == "movs" || Mnemonic == "isb" ||
+      Mnemonic == "clrex") {
     CanAcceptPredicationCode = false;
   } else {
     CanAcceptPredicationCode = true;