Psi2ir: fix function type check for fun interface conversion

Parameter of a synthetic SAM adapter always has a function type (not a
subtype). Checking for the subtypes broke the case from KT-46908, where
fun interface is itself a subtype of a function type.

 #KT-46908 Fixed

compiler/testData/codegen/box/funInterface/kt46908_functionSupertype.kt

@@ -0,0 +1,18 @@
+// IGNORE_BACKEND: JS, JS_IR, WASM
+
+fun interface Foo : () -> Int
+
+fun id(foo: Foo): Any = foo
+
+fun box(): String {
+    val p1 = object : Foo {
+        override fun invoke(): Int = 42
+        override fun toString(): String = "OK"
+    }
+    val p2 = id(p1)
+
+    if (p1 !== p2) return "Fail identity equals"
+    if (p1.toString() != p2.toString()) return "Fail toString"
+
+    return p2.toString()
+}

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.fir.kt.txt

@@ -0,0 +1,11 @@
+fun interface Foo : Function0<Int> {
+
+}
+
+fun id(foo: Foo): Any {
+  return foo
+}
+
+fun test(foo: Foo) {
+  id(foo = foo) /*~> Unit */
+}

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.fir.txt

@@ -0,0 +1,31 @@
+FILE fqName:<root> fileName:/functionSupertype.kt
+  CLASS INTERFACE name:Foo modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Function0<kotlin.Int>]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Foo
+    FUN FAKE_OVERRIDE name:invoke visibility:public modality:ABSTRACT <> ($this:kotlin.Function0<R of kotlin.Function0>) returnType:kotlin.Int [fake_override,operator]
+      overridden:
+        public abstract fun invoke (): R of kotlin.Function0 [operator] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Function0<R of kotlin.Function0>
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:id visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Any
+    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>'
+        GET_VAR 'foo: <root>.Foo declared in <root>.id' type=<root>.Foo origin=null
+  FUN name:test visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Unit
+    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
+    BLOCK_BODY
+      TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
+        CALL 'public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>' type=kotlin.Any origin=null
+          foo: GET_VAR 'foo: <root>.Foo declared in <root>.test' type=<root>.Foo origin=null

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.kt

@@ -0,0 +1,9 @@
+// IGNORE_BACKEND: JS_IR
+
+fun interface Foo : () -> Int
+
+fun id(foo: Foo): Any = foo
+
+fun test(foo: Foo) {
+    id(foo)
+}

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.kt.txt

@@ -0,0 +1,11 @@
+fun interface Foo : Function0<Int> {
+
+}
+
+fun id(foo: Foo): Any {
+  return foo
+}
+
+fun test(foo: Foo) {
+  id(foo = foo) /*~> Unit */
+}

compiler/testData/ir/irText/expressions/funInterface/functionSupertype.txt

@@ -0,0 +1,31 @@
+FILE fqName:<root> fileName:/functionSupertype.kt
+  CLASS INTERFACE name:Foo modality:ABSTRACT visibility:public [fun] superTypes:[kotlin.Function0<kotlin.Int>]
+    $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Foo
+    FUN FAKE_OVERRIDE name:invoke visibility:public modality:ABSTRACT <> ($this:kotlin.Function0<kotlin.Int>) returnType:kotlin.Int [fake_override,operator]
+      overridden:
+        public abstract fun invoke (): R of kotlin.Function0 [operator] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Function0<kotlin.Int>
+    FUN FAKE_OVERRIDE name:equals visibility:public modality:OPEN <> ($this:kotlin.Any, other:kotlin.Any?) returnType:kotlin.Boolean [fake_override,operator]
+      overridden:
+        public open fun equals (other: kotlin.Any?): kotlin.Boolean [fake_override,operator] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+      VALUE_PARAMETER name:other index:0 type:kotlin.Any?
+    FUN FAKE_OVERRIDE name:hashCode visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.Int [fake_override]
+      overridden:
+        public open fun hashCode (): kotlin.Int [fake_override] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+    FUN FAKE_OVERRIDE name:toString visibility:public modality:OPEN <> ($this:kotlin.Any) returnType:kotlin.String [fake_override]
+      overridden:
+        public open fun toString (): kotlin.String [fake_override] declared in kotlin.Function0
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Any
+  FUN name:id visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Any
+    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
+    BLOCK_BODY
+      RETURN type=kotlin.Nothing from='public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>'
+        GET_VAR 'foo: <root>.Foo declared in <root>.id' type=<root>.Foo origin=null
+  FUN name:test visibility:public modality:FINAL <> (foo:<root>.Foo) returnType:kotlin.Unit
+    VALUE_PARAMETER name:foo index:0 type:<root>.Foo
+    BLOCK_BODY
+      TYPE_OP type=kotlin.Unit origin=IMPLICIT_COERCION_TO_UNIT typeOperand=kotlin.Unit
+        CALL 'public final fun id (foo: <root>.Foo): kotlin.Any declared in <root>' type=kotlin.Any origin=null
+          foo: GET_VAR 'foo: <root>.Foo declared in <root>.test' type=<root>.Foo origin=null