Clarify error message when both asm! and global_asm! are unsupported

Author: Amanieu

compiler/rustc_ast_lowering/src/asm.rs

@@ -15,7 +15,8 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         // lowering the register contraints in this case.
         let asm_arch = if self.sess.opts.actually_rustdoc { None } else { self.sess.asm_arch };
         if asm_arch.is_none() && !self.sess.opts.actually_rustdoc {
-            struct_span_err!(self.sess, sp, E0472, "asm! is unsupported on this target").emit();
+            struct_span_err!(self.sess, sp, E0472, "inline assembly is unsupported on this target")
+                .emit();
         }
         if asm.options.contains(InlineAsmOptions::ATT_SYNTAX)
             && !matches!(asm_arch, Some(asm::InlineAsmArch::X86 | asm::InlineAsmArch::X86_64))

src/test/ui/asm/bad-arch.rs

@@ -18,9 +18,9 @@ trait Sized {}
 fn main() {
     unsafe {
         asm!("");
-        //~^ ERROR asm! is unsupported on this target
+        //~^ ERROR inline assembly is unsupported on this target
     }
 }
 
 global_asm!("");
-//~^ ERROR asm! is unsupported on this target
+//~^ ERROR inline assembly is unsupported on this target

src/test/ui/asm/bad-arch.stderr

@@ -1,10 +1,10 @@
-error[E0472]: asm! is unsupported on this target
+error[E0472]: inline assembly is unsupported on this target
   --> $DIR/bad-arch.rs:20:9
    |
 LL |         asm!("");
    |         ^^^^^^^^^
 
-error[E0472]: asm! is unsupported on this target
+error[E0472]: inline assembly is unsupported on this target
   --> $DIR/bad-arch.rs:25:1
    |
 LL | global_asm!("");