Use JvmPackageTable from bootstrap compiler in KotlinModuleShadowTransformer

Instead of generating another copy of it into buildSrc. Also move
KotlinModuleShadowTransformer to kotlin-reflect's build script, to its
only usage

generators/src/org/jetbrains/kotlin/generators/protobuf/GenerateProtoBuf.kt

@@ -73,8 +73,6 @@ fun main(args: Array<String>) {
             modifyAndExecProtoc(protoPath)
         }
 
-        generateJvmPackageTableToBuildSrc()
-
         println()
         println("Do not forget to run GenerateProtoBufCompare")
     }
@@ -161,7 +159,3 @@ private fun modifyForDebug(protoPath: ProtoPath): String {
     }
     return text
 }
-
-private fun generateJvmPackageTableToBuildSrc() {
-    execProtoc("core/descriptors.jvm/src/jvm_package_table.proto", "buildSrc/src/main/java")
-}