Native benchmark with no package specified fails to compile

[PavelPunegov]

Consider the following benchmark that doesn't have a package declaration

import kotlinx.benchmark.*
import kotlin.math.*

@State(Scope.Benchmark)
open class RootBenchmark {
    @Benchmark
    open fun mathBenchmark(): Double {
        return log(sqrt(3.0) * cos(3.0), 2.0)
    }
}

It fails to compile with:

e: build/benchmarks/native/sources/kotlinx/benchmark/generated/%3Croot%3E/RootBenchmark_Descriptor.kt:1:37 Name contains illegal characters: "<>"
e: build/benchmarks/native/sources/kotlinx/benchmark/generated/%3Croot%3E/RootBenchmark_Descriptor.kt:3:8 Unresolved reference: `<root>`
e: build/benchmarks/native/sources/kotlinx/benchmark/generated/%3Croot%3E/RootBenchmark_Descriptor.kt:18:31 Unresolved reference: RootBenchmark

SuiteSourceGenerator creates Descriptor with the following code, that is not valid for compiler.

package kotlinx.benchmark.generated.`<root>`

import `<root>`.RootBenchmark