[llvm_ir_correct] Expect memory(none) as replacements for readnone

The `readnone` function attribute has been replaced with `memory(none)`, at
least in some cases. This patch updates test/llvm_ir_correct/sincos.f90 to
be compatible with both LLVM 15 and LLVM 16. See the Discourse link below
for details:

  https://discourse.llvm.org/t/rfc-unify-memory-effect-attributes/65579

test/llvm_ir_correct/sincos.f90

@@ -46,4 +46,4 @@ subroutine testB(r1,r2,r3,r4,r5,r6)
 ! CHECK: declare float @__ps_sin_1(float) #[[ATTR_ID]]
 ! CHECK: declare float @__ps_cos_1(float) #[[ATTR_ID]]
 
-! CHECK: attributes #[[ATTR_ID]] = { nounwind readnone willreturn
+! CHECK: attributes #[[ATTR_ID]] = { nounwind {{willreturn memory\(none\)|readnone willreturn}}