Regres: Don't treat non-zero error codes as crashes.

tests/regres/cause/cause.go

@@ -19,15 +19,8 @@ import (
 	"fmt"
 )
 
-// errWithCause is an error that wrap an inner error with additional info.
-type errWithCause struct {
-	cause error
-	msg   string
-}
-
-func (e errWithCause) Error() string { return fmt.Sprintf("%s. Cause: %v", e.msg, e.cause) }
-
 // Wrap returns a new error wrapping cause with the additional message.
 func Wrap(cause error, msg string, args ...interface{}) error {
-	return errWithCause{cause, fmt.Sprintf(msg, args...)}
+	s := fmt.Sprintf(msg, args...)
+	return fmt.Errorf("%v. Cause: %w", s, cause)
 }

tests/regres/main.go

@@ -1333,6 +1333,14 @@ nextTest:
 		out := string(outRaw)
 		out = strings.ReplaceAll(out, t.srcDir, "<SwiftShader>")
 		out = strings.ReplaceAll(out, exe, "<dEQP>")
+
+		// Don't treat non-zero error codes as crashes.
+		var exitErr *exec.ExitError
+		if errors.As(err, &exitErr) {
+			out += fmt.Sprintf("\nProcess terminated with code %d", exitErr.ExitCode())
+			err = nil
+		}
+
 		switch err.(type) {
 		default:
 			for _, test := range []struct {