[FIR] optimize direct allocation of empty ConeTypeProjection arrays

On the snapshot from KTIJ-26260 empty ConeTypeProjection arrays take about 10mb

compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeIntegerLiteralType.kt

@@ -14,7 +14,7 @@ sealed class ConeIntegerLiteralType(
     abstract val possibleTypes: Collection<ConeClassLikeType>
     abstract val supertypes: List<ConeClassLikeType>
 
-    final override val typeArguments: Array<out ConeTypeProjection> = emptyArray()
+    final override val typeArguments: Array<out ConeTypeProjection> get() = EMPTY_ARRAY
     final override val attributes: ConeAttributes get() = ConeAttributes.Empty
 
     abstract fun getApproximatedType(expectedType: ConeKotlinType? = null): ConeClassLikeType

compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeTypeVariableAndStubTypes.kt

@@ -16,7 +16,7 @@ class ConeTypeVariableType(
     override val lookupTag: ConeTypeVariableTypeConstructor,
     override val attributes: ConeAttributes = ConeAttributes.Empty,
 ) : ConeLookupTagBasedType() {
-    override val typeArguments: Array<out ConeTypeProjection> get() = emptyArray()
+    override val typeArguments: Array<out ConeTypeProjection> get() = EMPTY_ARRAY
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
         if (other !is ConeTypeVariableType) return false
@@ -65,7 +65,7 @@ sealed class ConeStubType(val constructor: ConeStubTypeConstructor, override val
     ConeSimpleKotlinType() {
 
     override val typeArguments: Array<out ConeTypeProjection>
-        get() = emptyArray()
+        get() = EMPTY_ARRAY
 
     override val attributes: ConeAttributes
         get() = ConeAttributes.Empty

compiler/fir/cones/src/org/jetbrains/kotlin/fir/types/ConeTypes.kt

@@ -144,7 +144,7 @@ data class ConeCapturedType(
     )
 
     override val typeArguments: Array<out ConeTypeProjection>
-        get() = emptyArray()
+        get() = EMPTY_ARRAY
 
     override fun equals(other: Any?): Boolean {
         if (this === other) return true
@@ -220,7 +220,7 @@ class ConeIntersectionType(
     val alternativeType: ConeKotlinType? = null,
 ) : ConeSimpleKotlinType(), IntersectionTypeConstructorMarker {
     override val typeArguments: Array<out ConeTypeProjection>
-        get() = emptyArray()
+        get() = EMPTY_ARRAY
 
     override val nullability: ConeNullability
         get() = ConeNullability.NOT_NULL