Remove backend tests on old inference

Also remove any mentions of NewInference, and rename some tests.

compiler/testData/ir/irText/expressions/callableReferences/adaptedExtensionFunctions.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType
-
 fun use(f: C.(Int) -> Unit) {}
 
 class C
@@ -20,4 +18,4 @@ fun testExtensionDefault() {
 
 fun testExtensionBoth() {
     use(C::extensionBoth)
-}
+}

compiler/testData/ir/irText/expressions/callableReferences/caoWithAdaptationForSam.kt

@@ -1,5 +1,4 @@
 // IGNORE_BACKEND_FIR: JVM_IR
-// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType +FunctionalInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
 
 fun interface IFoo {
     fun foo(i: Int)
@@ -45,4 +44,4 @@ fun test6(a: Any) {
     a as (Int) -> Unit
     a as IFoo
     A[a] += 1
-}
+}

compiler/testData/ir/irText/expressions/callableReferences/constructorWithAdaptedArguments.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
-
 fun use(fn: (Int) -> Any) = fn(42)
 
 class C(vararg xs: Int)
@@ -12,4 +10,4 @@ fun testConstructor() = use(::C)
 
 fun testInnerClassConstructor(outer: Outer) = use(outer::Inner)
 
-fun testInnerClassConstructorCapturingOuter() = use(Outer()::Inner)
+fun testInnerClassConstructorCapturingOuter() = use(Outer()::Inner)

compiler/testData/ir/irText/expressions/callableReferences/unboundMemberReferenceWithAdaptedArguments.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
-
 fun use1(fn: (A, Int) -> Unit) {}
 
 fun use2(fn: (Int) -> Unit) {}

compiler/testData/ir/irText/expressions/callableReferences/withAdaptationForSam.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference +FunctionReferenceWithDefaultValueAsOtherType +FunctionalInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
-
 fun interface IFoo {
     fun foo(i: Int)
 }
@@ -11,4 +9,3 @@ fun withVararg(vararg xs: Int) = 42
 fun test() {
     useFoo(::withVararg)
 }
-

compiler/testData/ir/irText/expressions/callableReferences/withAdaptedArguments.kt

@@ -1,4 +1,3 @@
-// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
 import Host.importedObjectMemberWithVarargs
 
 fun use(fn: (Int) -> String) = fn(1)
@@ -27,4 +26,4 @@ fun testImportedObjectMember() = use(::importedObjectMemberWithVarargs)
 
 fun testDefault0() = use0(::fnWithDefaults)
 
-fun testVararg0() = use0(::fnWithVarargs)
+fun testVararg0() = use0(::fnWithVarargs)

compiler/testData/ir/irText/expressions/callableReferences/withArgumentAdaptationAndReceiver.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
-
 fun use(fn: (Int) -> Unit) { fn(1) }
 
 class Host {
@@ -26,4 +24,4 @@ class Host {
     fun testBoundReceiverExpression() {
         use(Host()::withVararg)
     }
-}
+}

compiler/testData/ir/irText/expressions/callableReferences/withVarargViewedAsArray.kt

@@ -1,5 +1,3 @@
-// !LANGUAGE: +NewInference, +FunctionReferenceWithDefaultValueAsOtherType
-
 fun sum(vararg args: Int): Int {
     var result = 0
     for (arg in args)