FIR: Rename stub type for builder inference

compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/ConeInferenceContext.kt

@@ -264,7 +264,7 @@ interface ConeInferenceContext : TypeSystemInferenceExtensionContext, ConeTypeCo
 
     override fun createStubTypeForBuilderInference(typeVariable: TypeVariableMarker): StubTypeMarker {
         require(typeVariable is ConeTypeVariable) { "$typeVariable should subtype of ${ConeTypeVariable::class.qualifiedName}" }
-        return ConeStubTypeForBuilderInference(typeVariable, ConeNullability.create(typeVariable.defaultType().isMarkedNullable()))
+        return ConeStubTypeForChainInference(typeVariable, ConeNullability.create(typeVariable.defaultType().isMarkedNullable()))
     }
 
     override fun createStubTypeForTypeVariablesInSubtyping(typeVariable: TypeVariableMarker): StubTypeMarker {

compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/ConeTypeContext.kt

@@ -429,7 +429,7 @@ interface ConeTypeContext : TypeSystemContext, TypeSystemOptimizationContext, Ty
     }
 
     override fun SimpleTypeMarker.isStubTypeForBuilderInference(): Boolean {
-        return this is ConeStubTypeForBuilderInference
+        return this is ConeStubTypeForChainInference
     }
 
     override fun TypeConstructorMarker.unwrapStubTypeVariableConstructor(): TypeConstructorMarker {

compiler/fir/providers/src/org/jetbrains/kotlin/fir/types/TypeUtils.kt

@@ -165,7 +165,7 @@ fun <T : ConeKotlinType> T.withNullability(
             ConeNullability.UNKNOWN -> this // TODO: is that correct?
             ConeNullability.NOT_NULL -> this
         }
-        is ConeStubTypeForBuilderInference -> ConeStubTypeForBuilderInference(constructor, nullability)
+        is ConeStubTypeForChainInference -> ConeStubTypeForChainInference(constructor, nullability)
         is ConeStubTypeForTypeVariableInSubtyping -> ConeStubTypeForTypeVariableInSubtyping(constructor, nullability)
         is ConeDefinitelyNotNullType -> when (nullability) {
             ConeNullability.NOT_NULL -> this