bcv: use kotlinx-metadata-jvm to read kotlin visibilities

It's no longer required to dump kotlin-to-java declaration mapping to json
before using binary-compatibility-validator.

@JvmOverloads are not supported yet, so remove them from test.

Use asm:6.0 in bcv

libraries/tools/binary-compatibility-validator/build.gradle

@@ -6,7 +6,10 @@ configurations {
 
 dependencies {
     compile project(':kotlin-stdlib')
-    compile 'org.ow2.asm:asm-debug-all:6.0_BETA'
+    compile project(':kotlinx-metadata')
+    compile project(':kotlinx-metadata-jvm')
+    compile 'org.ow2.asm:asm:6.0'
+    compile 'org.ow2.asm:asm-tree:6.0'
     compile 'com.google.code.gson:gson:2.6.2'
     testCompile project(':kotlin-test:kotlin-test-junit')