Add compatibility warning for SAM conversions on Kotlin functions

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/sam/JavaBasedSamConversionResolver.kt

@@ -38,4 +38,7 @@ object JavaBasedSamConversionOracle : SamConversionOracle {
         val descriptor = samType.constructor.declarationDescriptor
         return descriptor is ClassDescriptor && (descriptor.isFun || descriptor is JavaClassDescriptor)
     }
+
+    override fun isJavaApplicableCandidate(candidate: CallableDescriptor): Boolean =
+        shouldRunSamConversionForFunction(candidate)
 }

compiler/frontend.java/src/org/jetbrains/kotlin/load/java/sam/JvmSamConversionOracle.kt

@@ -22,4 +22,7 @@ class JvmSamConversionOracle(
 
     override fun isPossibleSamType(samType: KotlinType): Boolean =
         JavaBasedSamConversionOracle.isPossibleSamType(samType)
+
+    override fun isJavaApplicableCandidate(candidate: CallableDescriptor): Boolean =
+        JavaBasedSamConversionOracle.shouldRunSamConversionForFunction(candidate)
 }