JVM IR: do not generate generic signature for $delegate field

See ee7bbbf530

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/codegen/ClassCodegen.kt

@@ -211,7 +211,9 @@ open class ClassCodegen protected constructor(
         if (field.origin == IrDeclarationOrigin.FAKE_OVERRIDE) return
 
         val fieldType = typeMapper.mapType(field)
-        val fieldSignature = typeMapper.mapFieldSignature(field)
+        val fieldSignature =
+            if (field.origin == IrDeclarationOrigin.DELEGATE) null
+            else typeMapper.mapFieldSignature(field)
         val fieldName = field.name.asString()
         // The ConstantValue attribute makes the initializer part of the ABI, which is why since 1.4
         // it is no longer set unless the property is explicitly `const`.

compiler/testData/codegen/box/reflection/genericSignature/genericBackingFieldSignature.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 // TARGET_BACKEND: JVM
 
 // WITH_REFLECT

compiler/testData/writeSignature/backingFieldForGenericDelegated.kt

@@ -1,5 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
-
 import kotlin.reflect.KProperty
 import kotlin.reflect.KProperty1
 
@@ -17,4 +15,4 @@ class Test {
 
 // field: Test::additionalText$delegate
 // jvm signature: LDVal;
-// generic signature: null
+// generic signature: null