Rollup merge of #110853 - tamird:compiletest-bpflinker-support, r=wesleywiser

compiletest: add bpf-linker assembly support

src/tools/compiletest/src/runtest.rs

@@ -224,6 +224,7 @@ enum Emit {
     Metadata,
     LlvmIr,
     Asm,
+    LinkArgsAsm,
 }
 
 impl<'test> TestCx<'test> {
@@ -2035,6 +2036,9 @@ fn make_compile_args(
             Emit::Asm => {
                 rustc.args(&["--emit", "asm"]);
             }
+            Emit::LinkArgsAsm => {
+                rustc.args(&["-Clink-args=--emit=asm"]);
+            }
         }
 
         if !is_rustdoc {
@@ -2328,6 +2332,10 @@ fn compile_test_and_save_assembly(&self) -> (ProcRes, PathBuf) {
                 emit = Emit::Asm;
             }
 
+            Some("bpf-linker") => {
+                emit = Emit::LinkArgsAsm;
+            }
+
             Some("ptx-linker") => {
                 // No extra flags needed.
             }