[KT-42234] Moved optimization flags to konan.properties

Combined with KT-40670, it simplifies tuning of LLVM optimization and compilation pipeline.

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/Configurables.kt

@@ -53,6 +53,10 @@ interface Configurables : TargetableExternalStorage {
     val absoluteTargetToolchain get() = absolute(targetToolchain)
     val absoluteLlvmHome get() = absolute(llvmHome)
 
+    val targetCpu get() = targetString("targetCpu")
+    val targetCpuFeatures get() = targetString("targetCpuFeatures")
+    val llvmInlineThreshold get() = targetString("llvmInlineThreshold")
+
     val runtimeDefinitions get() = targetList("runtimeDefinitions")
 }
 
@@ -85,6 +89,5 @@ interface WasmConfigurables : TargetableConfigurables, ClangFlags, LldFlags
 
 interface ZephyrConfigurables : TargetableConfigurables, ClangFlags {
     val boardSpecificClangFlags get() = targetList("boardSpecificClangFlags")
-    val targetCpu get() = targetString("targetCpu")
     val targetAbi get() = targetString("targetAbi")
 }