Support @CName annotation for reverse C interop, similar to @JvmName. (#1237)

backend.native/tests/build.gradle

@@ -2375,7 +2375,8 @@ task produce_dynamic(type: DynamicKonanTest) {
                 "RO property is 42\n" +
                 "RW property is 239\n" +
                 "enum100 = 100\n" +
-                "object = 42\n"
+                "object = 42\n" +
+                "topLevel = 777 3\n"
 }
 
 task buildKonanStdlibTests(type: BuildKonanTest) {

backend.native/tests/produce_dynamic/simple/hello.kt

@@ -12,6 +12,16 @@ open class Base {
 
     open fun fooParam(arg0: String, arg1: Int) = println("Base.fooParam: $arg0 $arg1")
 
+    @konan.internal.CName(fullName = "", shortName = "strangeName") fun странноеИмя() = 111
+
+}
+
+@konan.internal.CName(fullName = "topLevelFunctionFromC", shortName = "topLevelFunctionFromCShort")
+fun topLevelFunction(x1: Int, x2: Int) = x1 - x2
+
+@konan.internal.CName("topLevelFunctionVoidFromC")
+fun topLevelFunctionVoid(x1: Int) {
+    assert(x1 == 42)
 }
 
 // Enum.

backend.native/tests/produce_dynamic/simple/main.c

@@ -18,7 +18,6 @@ int main(void) {
 
     const char* string = __ kotlin.root.getString();
 
-
     __ kotlin.root.hello();
     __ kotlin.root.Base.foo(base);
     __ kotlin.root.Base.fooParam(base, "a", 1);
@@ -37,6 +36,10 @@ int main(void) {
 
     printf("object = %d\n",  __ kotlin.root.Codeable.asCode(object1));
 
+    topLevelFunctionVoidFromC(42);
+    __ kotlin.root.topLevelFunctionVoid(42);
+    printf("topLevel = %d %d\n", topLevelFunctionFromC(780, 3), __ kotlin.root.topLevelFunctionFromCShort(5, 2));
+
     __ DisposeString(string);
     __ DisposeStablePointer(base.pinned);
     __ DisposeStablePointer(child.pinned);