ARM Assembler support for DMB instruction.

Flesh out the options supported for the instruction. Shuffle tests a bit and
add entries for the rest of the options. Add an alias to handle the default
operand of "sy".



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135109 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 499c954..2c45d2e 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -1343,10 +1343,14 @@
   unsigned Opt = StringSwitch<unsigned>(OptStr.slice(0, OptStr.size()))
     .Case("sy",    ARM_MB::SY)
     .Case("st",    ARM_MB::ST)
+    .Case("sh",    ARM_MB::ISH)
     .Case("ish",   ARM_MB::ISH)
+    .Case("shst",  ARM_MB::ISHST)
     .Case("ishst", ARM_MB::ISHST)
     .Case("nsh",   ARM_MB::NSH)
+    .Case("un",    ARM_MB::NSH)
     .Case("nshst", ARM_MB::NSHST)
+    .Case("unst",  ARM_MB::NSHST)
     .Case("osh",   ARM_MB::OSH)
     .Case("oshst", ARM_MB::OSHST)
     .Default(~0U);