[AArch64] AsmParser should be case insensitive about accepting vector register names.

Differential Revision: http://reviews.llvm.org/D10320

llvm-svn: 239353
diff --git a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
index 41615b6..063c053 100644
--- a/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
+++ b/llvm/lib/Target/AArch64/AsmParser/AArch64AsmParser.cpp
@@ -1764,7 +1764,7 @@
 /// }
 
 static unsigned matchVectorRegName(StringRef Name) {
-  return StringSwitch<unsigned>(Name)
+  return StringSwitch<unsigned>(Name.lower())
       .Case("v0", AArch64::Q0)
       .Case("v1", AArch64::Q1)
       .Case("v2", AArch64::Q2)