IR: remove IrSimpleTypeBuilder.variance

IrCapturedType (which is a IrSimpleType) does not have variance, so it
is confusing to have it in IrSimpleTypeBuilder, and it's clearer to
construct type projection separately anyway.

compiler/ir/serialization.common/src/org/jetbrains/kotlin/backend/common/serialization/IrBodyDeserializer.kt

@@ -212,7 +212,7 @@ class IrBodyDeserializer(
             val rawType = with(IrSimpleTypeBuilder()) {
                 arguments = typeParameters.memoryOptimizedMap {
                     classifier = it.symbol
-                    buildTypeProjection()
+                    buildSimpleType()
                 }
                 classifier = klass.symbol
                 buildSimpleType()