Resolve `macro-error` diagnostics on asm & llvm_asm

We currently stub these out as returning unit.

This fixes spurious RA diagnostics in the following:
```rust
unsafe { asm!(""); llvm_asm!(""); }
```

1 files changed, 15 insertions, 0 deletions

diff --git a/crates/hir_expand/src/builtin_macro.rs b/crates/hir_expand/src/builtin_macro.rs
index 8db8c7d0c..b1b432ded 100644
--- a/crates/hir_expand/src/builtin_macro.rs
+++ b/crates/hir_expand/src/builtin_macro.rs
@@ -95,6 +95,8 @@ register_builtin! {
     // format_args_nl only differs in that it adds a newline in the end,
     // so we use the same stub expansion for now
     (format_args_nl, FormatArgsNl) => format_args_expand,
+    (llvm_asm, LlvmAsm) => asm_expand,
+    (asm, Asm) => asm_expand,
 
     EAGER:
     (compile_error, CompileError) => compile_error_expand,
@@ -271,6 +273,19 @@ fn format_args_expand(
     ExpandResult::ok(expanded)
 }
 
+fn asm_expand(
+    _db: &dyn AstDatabase,
+    _id: LazyMacroId,
+    _tt: &tt::Subtree,
+) -> ExpandResult<tt::Subtree> {
+    // both asm and llvm_asm don't return anything, so we can expand them to nothing,
+    // for now
+    let expanded = quote! {
+        ()
+    };
+    ExpandResult::ok(expanded)
+}
+
 fn unquote_str(lit: &tt::Literal) -> Option<String> {
     let lit = ast::make::tokens::literal(&lit.to_string());
     let token = ast::String::cast(lit)?;