[llvm][llvm-dis] Fix 'llvm-dis' with '--materialize-metadata --show-annotations' crashes (llvm#164819)

Author: t-baydyusenov

llvm/lib/IR/AsmWriter.cpp

@@ -4082,10 +4082,10 @@ void AssemblyWriter::printTypeIdentities() {
 
 /// printFunction - Print all aspects of a function.
 void AssemblyWriter::printFunction(const Function *F) {
-  if (AnnotationWriter) AnnotationWriter->emitFunctionAnnot(F, Out);
-
   if (F->isMaterializable())
     Out << "; Materializable\n";
+  else if (AnnotationWriter)
+    AnnotationWriter->emitFunctionAnnot(F, Out);
 
   const AttributeList &Attrs = F->getAttributes();
   if (Attrs.hasFnAttrs()) {

llvm/test/Assembler/metadata-annotations.ll

@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | llvm-dis --materialize-metadata --show-annotations | FileCheck %s
+
+; CHECK: ; Materializable
+; CHECK-NEXT: define dso_local i32 @test() {}
+define dso_local i32 @test() {
+entry:
+  ret i32 0
+}
+