8216039: TLS with BC and RSASSA-PSS breaks ECDHServerKeyExchange
Summary: Add internal Signature init methods to select provider based on both key and parameter
Reviewed-by: xuelei
8221430: StringBuffer(CharSequence) constructor truncates when -XX:-CompactStrings specified
Reviewed-by: igerasim, rriggs
Contributed-by: Andrew Leonard <andrew_m_leonard@uk.ibm.com>, Ivan Gerasimov <ivan.gerasimov@oracle.com>