As spec'd in Javadoc, make getErasure() return this for generic types

Author: mickaelistria

org.eclipse.jdt.core.javac/src/org/eclipse/jdt/internal/javac/dom/JavacTypeBinding.java

@@ -1070,6 +1070,9 @@ public ITypeBinding getElementType() {
 
 	@Override
 	public JavacTypeBinding getErasure() {
+		if (isGenericType()) {
+			return this;
+		}
 		if (isArray()) {
 			JavacTypeBinding component = getComponentType().getErasure();
 			ArrayType arrayType = this.types.makeArrayType(component.type);