hg: graal/graal: only register AMD64Substitutions if the target architecture is AMD64

[doug.simon at oracle.com]

Changeset: a65cbe5432dd
Author:    Doug Simon <doug.simon at oracle.com>
Date:      2014-11-24 23:29 +0100
URL:       http://hg.openjdk.java.net/graal/graal/rev/a65cbe5432dd

only register AMD64Substitutions if the target architecture is AMD64

! graal/com.oracle.graal.replacements.amd64/src/com/oracle/graal/replacements/amd64/AMD64Substitutions.java