[clang] [Clang] Fix null pointer dereference in enum debug info generation (PR #97105)

[David Blaikie via cfe-commits]

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@@ -98,3 +98,6 @@ enum E8 { A8 = -128, B8 = 127 } x8;
 // CHECK-NOT: DIFlagEnumClass
 // CHECK: !DIEnumerator(name: "A8", value: -128)
 
+// Forward declaration of an enum class.
+enum class Color : int;
+// CHECK-NOT: !DICompositeType(tag: DW_TAG_enumeration_type, name: "Color"
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dwblaikie wrote:

Have you run this test? Because an unused enum like this usually isn't/shouldn't be emitted into the output... - note all the other enums have a variable declared of their type (the trailing "} xN;")

https://github.com/llvm/llvm-project/pull/97105