some comment fix for X86 and ARM

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150902 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86Subtarget.h b/lib/Target/X86/X86Subtarget.h
index a929992..a36d0d8 100644
--- a/lib/Target/X86/X86Subtarget.h
+++ b/lib/Target/X86/X86Subtarget.h
@@ -1,4 +1,4 @@
-//===---- X86Subtarget.h - Define Subtarget for the X86 --------*- C++ -*--===//
+//===-- X86Subtarget.h - Define Subtarget for the X86 ----------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //