[IR] Find types used by DIExpressions in debug records (llvm#892)

Author: epilk

llvm/lib/IR/TypeFinder.cpp

@@ -99,7 +99,11 @@ void TypeFinder::run(const Module &M, bool onlyNamed) {
             if (DVI->isDbgAssign()) {
               if (Value *Addr = DVI->getAddress())
                 incorporateValue(Addr);
+              if (auto *Expr = DVI->getRawAddressExpression())
+                incorporateMDNode(Expr);
             }
+            if (auto *Expr = DVI->getRawExpression())
+              incorporateMDNode(Expr);
           }
         }
       }

llvm/test/Assembler/DIExpressionNewDebugRecords.ll

@@ -0,0 +1,28 @@
+; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
+
+; CHECK: %struct.S = type { i32 }
+%struct.S = type { i32 }
+
+define dso_local i32 @f() !dbg !7 {
+entry:
+    ; CHECK: #dbg_value(ptr null, !9, !DIExpression(DIOpArg(0, ptr), DIOpDeref(%struct.S)), !11)
+    #dbg_value(ptr null, !9, !DIExpression(DIOpArg(0, ptr), DIOpDeref(%struct.S)), !11)
+  ret i32 0, !dbg !11
+}
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 18.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "print.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 5}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 18.0.0"}
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0)
+!8 = !DISubroutineType(types: !2)
+!9 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 3, type: !10)
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !DILocation(line: 3, column: 15, scope: !7)