Thumb parsing and encoding support for NOP.

The irony is not lost that this is not a completely trivial patchset.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138143 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 6a14387..3e768f2 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -2846,6 +2846,7 @@
       Mnemonic == "trap" || Mnemonic == "mrc2" || Mnemonic == "mrrc2" ||
       Mnemonic == "dsb" || Mnemonic == "isb" || Mnemonic == "clrex" ||
       Mnemonic == "setend" ||
+      (Mnemonic == "nop" && isThumbOne()) ||
       ((Mnemonic == "pld" || Mnemonic == "pli") && !isThumb()) ||
       ((Mnemonic.startswith("rfe") || Mnemonic.startswith("srs"))
         && !isThumb()) ||