Description:
Compiler crashes with StackOverFlowError for the following code. This is a *REGRESSION*. Compiler throws "cyclic inheritance involving S" in JDK 7 b24 error as it should be, but goes into infinite loop with PIT b26. Strangely, if i comment the second constructor it compiles fine.

<code>
bash-3.00$ cat CyclicTypeParameters.java
class CyclicTypeParameters<S extends T, T extends S>{
        CyclicTypeParameters(S s){
        }
        CyclicTypeParameters(){// Works fine on commenting this
        }
}
</code>
Compilation result is :
<output>
The system is out of resources.
Consult the following stack trace for details.
java.lang.StackOverflowError
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:952)
        at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3240)
        at com.sun.tools.javac.code.Types.erasure(Types.java:1502)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1525)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1505)
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:952)
        at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3240)
        at com.sun.tools.javac.code.Types.erasure(Types.java:1502)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1525)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1505)
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:952)
        at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3240)
        at com.sun.tools.javac.code.Types.erasure(Types.java:1502)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1525)
        at com.sun.tools.javac.code.Types$16.visitTypeVar(Types.java:1505)
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:952)
        at com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:3240)
        at com.sun.tools.javac.code.Types.erasure(Types.java:1502)
</output>
<version>
bash-3.2$ /net/bonsai.sfbay/w/builds/jdk/7/pit/b26/solaris-i586/jdk1.7.0/bin/java -version
java version "1.7.0-internal"
Java(TM) SE Runtime Environment (build 1.7.0-internal-jprtadm_18_Mar_2008_12_26-b00)
Java HotSpot(TM) Server VM (build 12.0-b01, mixed mode)
</version>
bash-3.2$ uname -a
SunOS bonsai 5.11 snv_77 i86pc i386 i86pc