[K/N][perf] Fixup target toolchain path for swift compilation

Fix swiftc path in the performance infrastructure. It has a separate
plugin to regular native-build-tools.

This fixes failures caused by the 3aeca1956e.
See also MR-KT-12948


Merge-request: KT-MR-13130
Merged-by: Pavel Punegov <Pavel.Punegov@jetbrains.com>

kotlin-native/performance/buildSrc/src/main/kotlin/benchmark/SwiftBenchmarkingPlugin.kt

@@ -127,7 +127,7 @@ open class SwiftBenchmarkingPlugin : BenchmarkingPlugin() {
         val platform = project.platformManager.platform(target)
         assert(platform.configurables is AppleConfigurables)
         val configs = platform.configurables as AppleConfigurables
-        val compiler = configs.absoluteTargetToolchain + "/usr/bin/swiftc"
+        val compiler = configs.absoluteTargetToolchain + "/bin/swiftc"
 
         val swiftTarget = configs.targetTriple.withOSVersion(configs.osVersionMin).toString()