Add two iforms to a table for looking up iforms that lock instructions (#550)

Author: Peter Goodman

lib/Arch/X86/Arch.cpp

@@ -319,6 +319,8 @@ std::map<xed_iform_enum_t, xed_iform_enum_t> kUnlockedIform = {
     {XED_IFORM_CMPXCHG16B_LOCK_MEMdq, XED_IFORM_CMPXCHG16B_MEMdq},
     {XED_IFORM_NEG_LOCK_MEMb, XED_IFORM_NEG_MEMb},
     {XED_IFORM_NEG_LOCK_MEMv, XED_IFORM_NEG_MEMv},
+    {XED_IFORM_XCHG_MEMv_GPRv, XED_IFORM_XCHG_MEMv_GPRv},
+    {XED_IFORM_XCHG_MEMb_GPR8, XED_IFORM_XCHG_MEMb_GPR8},
 };
 
 // Name of this instruction function.