Teach assembler to handle capitalised operation values for DSB instructions


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159259 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 830e9c0..68f1281 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -3260,7 +3260,7 @@
     return MatchOperand_NoMatch;
   StringRef OptStr = Tok.getString();
 
-  unsigned Opt = StringSwitch<unsigned>(OptStr.slice(0, OptStr.size()))
+  unsigned Opt = StringSwitch<unsigned>(OptStr.slice(0, OptStr.size()).lower())
     .Case("sy",    ARM_MB::SY)
     .Case("st",    ARM_MB::ST)
     .Case("sh",    ARM_MB::ISH)