parser: allow lock prefix instructions and numbered reg in asm inline

vlib/v/parser/parser.v

@@ -1253,6 +1253,11 @@ fn (mut p Parser) asm_stmt(is_top_level bool) ast.AsmStmt {
 		}
 		if p.tok.kind in [.key_in, .key_lock, .key_orelse, .key_select, .key_return] { // `in`, `lock`, `or`, `select`, `return` are v keywords that are also x86/arm/riscv/wasm instructions.
 			name += p.tok.kind.str()
+			if p.tok.kind == .key_lock && arch in [.i386, .amd64] {
+				p.next()
+				name += ' '
+				name += p.tok.lit
+			}
 			p.next()
 		} else if p.tok.kind == .number {
 			name += p.tok.lit
@@ -1764,7 +1769,11 @@ fn (mut p Parser) asm_ios(output bool) []ast.AsmIO {
 			if p.tok.kind == .at {
 				p.next()
 			} else {
-				p.check(.name)
+				if p.tok.kind == .number {
+					p.check(.number)
+				} else {
+					p.check(.name)
+				}
 			}
 		}
 		mut expr := p.expr(0)