Load Java overrides of Kotlin suspend functions as suspend, too

There's still some blind spots:
- Covariant overrides in Java (KT-25036)
- Current implementation assumes that when language version is 1.3 every suspend function
reference only release-coroutines-package Continuation
(we need to check if it's a correct statement)

 #KT-24848 Fixed
 #KT-25036 Open

compiler/backend/src/org/jetbrains/kotlin/codegen/coroutines/coroutineCodegenUtil.kt

@@ -19,8 +19,8 @@ import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper
 import org.jetbrains.kotlin.codegen.topLevelClassAsmType
 import org.jetbrains.kotlin.codegen.topLevelClassInternalName
-import org.jetbrains.kotlin.coroutines.isSuspendLambda
 import org.jetbrains.kotlin.config.*
+import org.jetbrains.kotlin.coroutines.isSuspendLambda
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.annotations.Annotations
 import org.jetbrains.kotlin.descriptors.impl.AnonymousFunctionDescriptor
@@ -240,7 +240,7 @@ fun <D : FunctionDescriptor> getOrCreateJvmSuspendFunctionView(
         setReturnType(function.builtIns.nullableAnyType)
         setValueParameters(it.valueParameters + continuationParameter)
         if (dropSuspend) {
-            setDropSuspend()
+            setIsSuspend(false)
         }
         putUserData(INITIAL_DESCRIPTOR_FOR_SUSPEND_FUNCTION, it)
     }
@@ -475,4 +475,4 @@ fun FunctionDescriptor.isSuspendLambdaOrLocalFunction() = this.isSuspend && when
     is AnonymousFunctionDescriptor -> this.isSuspendLambda
     is SimpleFunctionDescriptor -> this.visibility == Visibilities.LOCAL
     else -> false
-}
+}