FIC: Move sam related methods to ClassDescriptor, fix JVM backend part

core/descriptors.jvm/src/org/jetbrains/kotlin/load/java/descriptors/JavaClassDescriptor.java

@@ -16,18 +16,7 @@
 
 package org.jetbrains.kotlin.load.java.descriptors;
 
-import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.descriptors.ClassDescriptor;
-import org.jetbrains.kotlin.types.SimpleType;
 
 public interface JavaClassDescriptor extends ClassDescriptor {
-    // Use SingleAbstractMethodUtils.getFunctionTypeForSamInterface() where possible. This is only a fallback
-    @Nullable
-    SimpleType getDefaultFunctionTypeForSamInterface();
-
-    /**
-     * May return false even in case when the class is not SAM interface, but returns true only if it's definitely not a SAM.
-     * But it should work much faster than the exact check.
-     */
-    boolean isDefinitelyNotSamInterface();
 }