Fix support for i386 TLS GD-to-IE optimization.

Fix support for i386 TLS GD-to-IE optimization.

There are two cases to support, one with an SIB-form (6-byte) LEA,
the other with a 5-byte LEA and a NOP after the call __tls_get_addr.
Gold did not yet support the second case. This patch adds that
support.

gold/
	PR gold/18106
	* i386.cc (Target_i386::Relocate::tls_gd_to_ie): Fix support for
	non-SIB form of lea, with nop after the call.