CallSiteValue::get_called_fn_value() fails it assert when the callee is a PointerValue

[winux138]

Describe the Bug

thread 'main' panicked at /home/ju/.cargo/registry/src/index.crates.io-6f17d22bba15001f/inkwell-0.5.0/src/values/fn_value.rs:48:9:
assertion failed: !LLVMIsAFunction(value).is_null()
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

CallSiteValue::get_called_fn_value() fails it assert when the callee is a PointerValue.

Is there a way to tell if the callee is a PointerValue or a FunctionValue ?

To Reproduce

const LLVM_IR: &str = r#"
; ModuleID = 'main.c'
source_filename = "main.c"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"

; Function Attrs: noinline nounwind optnone uwtable
define dso_local void @dummy_fn() #0 {
  ret void
}

; Function Attrs: noinline nounwind optnone uwtable
define dso_local i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca ptr, align 8
  store i32 0, ptr %1, align 4
  call void @dummy_fn()
  ; The following 3 lines cause a panic
  store ptr @dummy_fn, ptr %2, align 8
  %3 = load ptr, ptr %2, align 8
  call void %3()
  ret i32 0
}

attributes #0 = { noinline nounwind optnone uwtable "frame-pointer"="all" "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3, !4}
!llvm.ident = !{!5}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{i32 7, !"frame-pointer", i32 2}
!5 = !{!"Ubuntu clang version 18.1.8 (++20240731024944+3b5b5c1ec4a3-1~exp1~20240731145000.144)"}
"#;

fn main() {
    let memory_buffer = inkwell::memory_buffer::MemoryBuffer::create_from_memory_range_copy(
        LLVM_IR.as_bytes(),
        "name",
    );

    let binding = inkwell::context::Context::create();
    let module = binding.create_module_from_ir(memory_buffer).unwrap();

    for f in module.get_functions() {
        for bb in f.get_basic_blocks() {
            for i in bb.get_instructions() {
                if let Ok(call_site_value) = inkwell::values::CallSiteValue::try_from(i) {
                    eprintln!(
                        "Found a call site: {:?}",
                        call_site_value.get_called_fn_value()
                    );
                }
            }
        }
    }
}

Expected Behavior
A primitive should be provided to distinguish calls to PointerValue from calls to FunctionValue.

LLVM Version (please complete the following information):

• LLVM Version: 18.0
• Inkwell Branch Used: llvm18-0

Desktop (please complete the following information):

• OS: ubuntu 22.04 (popOS)

Additional Context
Add any other context about the problem here.