ARM: fix vmov.i64 immediate validity check

Typo meant we were only checking the low byte (repeatedly).

llvm-svn: 275437
diff --git a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index d368e23..7d49302 100644
--- a/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -1731,7 +1731,7 @@
     if (!CE) return false;
     uint64_t Value = CE->getValue();
     // i64 value with each byte being either 0 or 0xff.
-    for (unsigned i = 0; i < 8; ++i)
+    for (unsigned i = 0; i < 8; ++i, Value >>= 8)
       if ((Value & 0xff) != 0 && (Value & 0xff) != 0xff) return false;
     return true;
   }