JVM IR: get rid of toIrBasedKotlinType in MethodSignatureMapper

Commonize (in terms of TypeSystemCommonBackendContext implementations
for KotlinType/IrType) code that computes optimal TypeMappingMode to
apply to different positions where inline class types can be present.

compiler/testData/codegen/box/callableReference/genericLocalClassConstructorReference.kt

@@ -1,7 +1,5 @@
 // DONT_TARGET_EXACT_BACKEND: WASM
 // WASM_MUTE_REASON: BINDING_RECEIVERS
-
-// IGNORE_BACKEND_FIR: JVM_IR
 // KT-42025
 
 open class L<LL>(val ll: LL)
@@ -22,4 +20,4 @@ val <PT> Rec<PT>.p: L<PT>
 fun <T1, T2, R> foo2(t1: T1, t2: T2, bb: (T1, T2) -> R): R = bb(t1, t2)
 
 fun box(): String =
-    Rec("O").fn().ll + Rec("K").p.ll
+    Rec("O").fn().ll + Rec("K").p.ll