hg: graal/graal-compiler: TraceRA: work around warning with newer ecj versions.

[doug.simon at oracle.com]

Changeset: dba757ef0c79
Author:    Josef Eisl <josef.eisl at jku.at>
Date:      2016-01-04 12:17 +0100
URL:       http://hg.openjdk.java.net/graal/graal-compiler/rev/dba757ef0c79

TraceRA: work around warning with newer ecj versions.

Fixing the warning would cause an error with older ecj versions.

! graal/com.oracle.graal.compiler.common/src/com/oracle/graal/compiler/common/alloc/TraceBuilder.java