Improve consistency of isClassRenamable and isMethodImmutable

This commit:

* Renames isMethodImmutable to isMethodRenamable and flips the value of
  the boolean it outputs accordingly.
* Updates all uses of isMethodRenamable to account for this.
* Makes the internal implementation more similar to isClassRenamable.

Signed-off-by: Graham <gpe@openrs2.dev>

deob/src/main/java/dev/openrs2/deob/remap/TypedRemapper.kt

@@ -204,25 +204,21 @@ class TypedRemapper private constructor(
             return true
         }
 
-        fun isMethodImmutable(classPath: ClassPath, partition: DisjointSet.Partition<MemberRef>): Boolean {
+        fun isMethodRenamable(classPath: ClassPath, partition: DisjointSet.Partition<MemberRef>): Boolean {
             for (method in partition) {
                 val clazz = classPath[method.owner]!!
 
-                if (method.name in EXCLUDED_METHODS) {
-                    return true
-                }
-
-                if (clazz.dependency) {
-                    return true
+                if (method.name in EXCLUDED_METHODS || clazz.dependency) {
+                    return false
                 }
 
                 val access = clazz.getAccess(MemberDesc(method))
-                if (access != null && (access and Opcodes.ACC_NATIVE) != 0) {
-                    return true
+                if (access != null && access and Opcodes.ACC_NATIVE != 0) {
+                    return false
                 }
             }
 
-            return false
+            return true
         }
 
         private fun createMethodMapping(
@@ -233,7 +229,7 @@ class TypedRemapper private constructor(
             var id = 0
 
             for (partition in disjointSet) {
-                if (isMethodImmutable(classPath, partition)) {
+                if (!isMethodRenamable(classPath, partition)) {
                     continue
                 }
 

deob/src/main/java/dev/openrs2/deob/transform/UnusedArgTransformer.kt

@@ -69,7 +69,7 @@ class UnusedArgTransformer : Transformer() {
                 }
                 is MethodInsnNode -> {
                     val invokePartition = inheritedMethodSets[MemberRef(insn)]
-                    if (invokePartition == null || TypedRemapper.isMethodImmutable(classPath, invokePartition)) {
+                    if (invokePartition == null || !TypedRemapper.isMethodRenamable(classPath, invokePartition)) {
                         continue@frame
                     }
 
@@ -113,7 +113,7 @@ class UnusedArgTransformer : Transformer() {
             }
 
             val partition = inheritedMethodSets[MemberRef(insn)]
-            if (partition == null || TypedRemapper.isMethodImmutable(classPath, partition)) {
+            if (partition == null || !TypedRemapper.isMethodRenamable(classPath, partition)) {
                 continue
             }
 
@@ -146,7 +146,7 @@ class UnusedArgTransformer : Transformer() {
     ): Boolean {
         // delete unused int args from the method itself
         val partition = inheritedMethodSets[MemberRef(clazz, method)]!!
-        if (TypedRemapper.isMethodImmutable(classPath, partition)) {
+        if (!TypedRemapper.isMethodRenamable(classPath, partition)) {
             return false
         }