[ARMTargetParser] Follow-up for r239099: one case was missed

llvm-svn: 239147
GitOrigin-RevId: acd1cd66c17fed8adeb7108ae8c6ae1f7671bac2
diff --git a/lib/Support/TargetParser.cpp b/lib/Support/TargetParser.cpp
index e09350e..9e81763 100644
--- a/lib/Support/TargetParser.cpp
+++ b/lib/Support/TargetParser.cpp
@@ -299,7 +299,7 @@
     .Case("v7r", "v7-r")
     .Case("v7m", "v7-m")
     .Case("v7em", "v7e-m")
-    .Cases("v8", "v8a", "aarch64", "arm64", "armv8-a")
+    .Cases("v8", "v8a", "aarch64", "arm64", "v8-a")
     .Case("v8.1a", "v8.1-a")
     .Default(Arch);
 }