[K/N] Add lowered suspend function mangling to avoid clashes

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

@@ -21,6 +21,7 @@ enum class MangleConstant(val prefix: Char, val separator: Char, val suffix: Cha
         const val ERROR_MARK = "<ERROR CLASS>"
         const val ERROR_DECLARATION = "<ERROR DECLARATION>"
         const val STATIC_MEMBER_MARK = "#static"
+        const val SUSPEND_FUNCTION_MARK = "#suspend"
         const val TYPE_PARAMETER_MARKER_NAME = "<TP>"
         const val TYPE_PARAMETER_MARKER_NAME_SETTER = "<STP>"
         const val BACKING_FIELD_NAME = "<BF>"

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

@@ -28,6 +28,7 @@ abstract class IrMangleComputer(protected val builder: StringBuilder, private va
     private var isRealExpect = false
 
     open fun IrFunction.platformSpecificFunctionName(): String? = null
+    open fun IrFunction.platformSpecificFunctionMarks(): List<String> = emptyList()
 
     open fun IrFunction.specialValueParamPrefix(param: IrValueParameter): String = ""
 
@@ -112,6 +113,10 @@ abstract class IrMangleComputer(protected val builder: StringBuilder, private va
             builder.appendSignature(MangleConstant.STATIC_MEMBER_MARK)
         }
 
+        platformSpecificFunctionMarks().forEach {
+            builder.appendSignature(it)
+        }
+
         extensionReceiverParameter?.let {
             if (!it.isHidden) {
                 builder.appendSignature(MangleConstant.EXTENSION_RECEIVER_PREFIX)