Remove the old x86 backend

tests/all/debug/lldb.rs

@@ -133,44 +133,6 @@ check: exited with status
     Ok(())
 }
 
-#[test]
-#[ignore]
-#[cfg(all(
-    any(target_os = "linux", target_os = "macos"),
-    target_pointer_width = "64",
-    // Ignore test on new backend. The value this is looking for is
-    // not available at the point that the breakpoint is set when
-    // compiled by the new backend.
-    feature = "old-x86-backend",
-))]
-pub fn test_debug_dwarf_ptr() -> Result<()> {
-    let output = lldb_with_script(
-        &[
-            "-g",
-            "--opt-level",
-            "0",
-            "tests/all/debug/testsuite/reverse-str.wasm",
-        ],
-        r#"b reverse-str.c:9
-r
-p __vmctx->set(),&*s
-c"#,
-    )?;
-
-    check_lldb_output(
-        &output,
-        r#"
-check: Breakpoint 1: no locations (pending)
-check: stop reason = breakpoint 1.1
-check: frame #0
-sameln: reverse(s=(__ptr =
-check: "Hello, world."
-check: resuming
-"#,
-    )?;
-    Ok(())
-}
-
 #[test]
 #[ignore]
 #[cfg(all(

tests/all/debug/translate.rs

@@ -109,26 +109,3 @@ check:        DW_AT_decl_line	(10)
     )
 }
 
-#[test]
-#[ignore]
-#[cfg(all(
-    any(target_os = "linux", target_os = "macos"),
-    target_arch = "x86_64",
-    target_pointer_width = "64",
-    // Ignore test on new backend. This is a specific test with hardcoded
-    // offsets and the new backend compiles the return basic-block at a different
-    // offset, causing mismatches.
-    feature = "old-x86-backend",
-))]
-fn test_debug_dwarf5_translate_lines() -> Result<()> {
-    check_line_program(
-        "tests/all/debug/testsuite/fib-wasm-dwarf5.wasm",
-        r##"
-check:   Address            Line   Column File   ISA Discriminator Flags
-check: 0x000000000000013c     15      3      1   0             0
-# The important point is that the following offset must be _after_ the `ret` instruction.
-# FIXME: this +1 increment might vary on other archs.
-nextln: 0x000000000000013d     15      3      1   0             0  end_sequence
-    "##,
-    )
-}