Add test for S_OBJNAME

tests/run-make/pdb-sobjname/filecheck.txt

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+CHECK: S_OBJNAME{{.+}}my_great_crate_name{{.+}}.o

tests/run-make/pdb-sobjname/main.rs

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+fn main() {}

tests/run-make/pdb-sobjname/rmake.rs

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+// Check if the pdb file contains an S_OBJNAME entry with the name of the .o file
+
+// This is because it used to be missing in #96475.
+// See https://github.com/rust-lang/rust/pull/115704
+
+//@ only-windows-msvc
+// Reason: pdb files are unique to this architecture
+
+use run_make_support::{llvm, rustc};
+
+fn main() {
+    rustc().input("main.rs").arg("-g").crate_name("my_great_crate_name").crate_type("bin").run();
+
+    let pdbutil_result =
+        llvm::LlvmPdbutil::new().arg("dump").arg("-symbols").input("my_great_crate_name.pdb").run();
+
+    llvm::llvm_filecheck().patterns("filecheck.txt").stdin_buf(pdbutil_result.stdout_utf8()).run();
+}