cgen: add rv32 inline assembly support (#26362)

Author: matthiaaas

vlib/v/gen/c/cgen.v

@@ -3360,9 +3360,8 @@ fn (mut g Gen) asm_stmt(stmt ast.AsmStmt) {
 			g.write(' ')
 		}
 		// swap destination and operands for att syntax, not for arm64
-		if template.args.len != 0 && !template.is_directive && stmt.arch != .arm64
-			&& stmt.arch != .s390x && stmt.arch != .ppc64le && stmt.arch != .loongarch64
-			&& stmt.arch != .rv64 {
+		if template.args.len != 0 && !template.is_directive
+			&& stmt.arch !in [.arm64, .s390x, .ppc64le, .loongarch64, .rv64, .rv32] {
 			template.args.prepend(template.args.last())
 			template.args.delete(template.args.len - 1)
 		}
@@ -3439,8 +3438,7 @@ fn (mut g Gen) asm_arg(arg ast.AsmArg, stmt ast.AsmStmt) {
 		ast.IntegerLiteral {
 			if stmt.arch == .arm64 {
 				g.write('#${arg.val}')
-			} else if stmt.arch == .s390x || stmt.arch == .ppc64le || stmt.arch == .loongarch64
-				|| stmt.arch == .rv64 {
+			} else if stmt.arch in [.s390x, .ppc64le, .loongarch64, .rv64, .rv32] {
 				g.write('${arg.val}')
 			} else {
 				g.write('\$${arg.val}')
@@ -3457,7 +3455,7 @@ fn (mut g Gen) asm_arg(arg ast.AsmArg, stmt ast.AsmStmt) {
 			g.write('\$${arg.val.str()}')
 		}
 		ast.AsmRegister {
-			if stmt.arch == .rv64 {
+			if stmt.arch in [.rv64, .rv32] {
 				g.write('${arg.name}')
 			} else if stmt.arch == .loongarch64 {
 				g.write('$${arg.name}')