Verifier: Move test from Assembler to right place and avoid grep (llvm#138113)

Author: arsenm

llvm/test/Assembler/2008-09-02-FunctionNotes2.ll

@@ -0,0 +1,7 @@
+; Test function notes
+; RUN: not llvm-as -disable-output %s 2>&1 | FileCheck %s
+
+; CHECK: Attributes 'noinline and alwaysinline' are incompatible
+define void @fn1() alwaysinline noinline {
+  ret void
+}