[x86] remove stale FIXME note from test; NFC

This was fixed with rL338592.

llvm-svn: 338593
diff --git a/llvm/test/CodeGen/X86/funnel-shift-rot.ll b/llvm/test/CodeGen/X86/funnel-shift-rot.ll
index 90574ef..3455a05 100644
--- a/llvm/test/CodeGen/X86/funnel-shift-rot.ll
+++ b/llvm/test/CodeGen/X86/funnel-shift-rot.ll
@@ -386,7 +386,7 @@
   ret <4 x i32> %f
 }
 
-; FIXME: Non power-of-2 types can't use the negated shift amount to avoid a select.
+; Non power-of-2 types can't use the negated shift amount to avoid a select.
 
 declare i7 @llvm.fshl.i7(i7, i7, i7)
 declare i7 @llvm.fshr.i7(i7, i7, i7)