hg: graal/graal-compiler: Guard agains out-of-bounds exception

[doug.simon at oracle.com]

Changeset: f20070e9f5a4
Author:    Christian Wimmer <christian.wimmer at oracle.com>
Date:      2016-02-04 11:31 -0800
URL:       http://hg.openjdk.java.net/graal/graal-compiler/rev/f20070e9f5a4

Guard agains out-of-bounds exception

! graal/com.oracle.graal.replacements/src/com/oracle/graal/replacements/nodes/LoadSnippetVarargParameterNode.java