[llvm-bugs] [Bug 43107] New: missed opt: function argument attribute propagation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43107

            Bug ID: 43107
           Summary: missed opt: function argument attribute propagation
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: gonzalobg88 at gmail.com
                CC: llvm-bugs at lists.llvm.org

See (https://llvm.godbolt.org/z/QJIvwX). This LLVM-IR: 

define void @bar(i32* %x) local_unnamed_addr #0 {
  tail call void @foo(i32* %x)
  ret void
}
declare void @foo(i32* noalias align 4 dereferenceable(4)) local_unnamed_addr
#0
attributes #0 = { nounwind nonlazybind }

is not optimized further by `opt`, but I'd expect the definition of `bar` to be
optimized to:

define void @bar(i32* noalias align 4 dereferenceable(4) %x) local_unnamed_addr
#0

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