Fix an it's vs. its typo.

llvm-svn: 218093
diff --git a/llvm/test/CodeGen/X86/coff-comdat2.ll b/llvm/test/CodeGen/X86/coff-comdat2.ll
index 6744b5b..58bc04e 100644
--- a/llvm/test/CodeGen/X86/coff-comdat2.ll
+++ b/llvm/test/CodeGen/X86/coff-comdat2.ll
@@ -6,4 +6,4 @@
 $foo = comdat largest
 @foo = global i32 0
 @bar = global i32 0, comdat $foo
-; CHECK: Associative COMDAT symbol 'foo' is not a key for it's COMDAT.
+; CHECK: Associative COMDAT symbol 'foo' is not a key for its COMDAT.