Add codegen test to validate IR for debuginfo

Author: mweber15

tests/codegen/issue-98678.rs

@@ -0,0 +1,11 @@
+// This test verifies the accuracy of emitted file and line debuginfo metadata.
+//
+// compile-flags: -C debuginfo=2
+#![crate_type = "lib"]
+
+// CHECK: ![[#FILE:]] = !DIFile({{.*}}filename:{{.*}}src/test/codegen/issue-98678.rs{{".*}})
+
+// CHECK: !DICompositeType({{.*"}}MyType{{".*}}file: ![[#FILE]]{{.*}}line: [[# @LINE + 1]],
+pub struct MyType;
+
+pub fn foo(_: MyType) {}