feat: support function references in frameless icall instructions

Author: xepozz

src/main/kotlin/com/github/xepozz/php_opcodes_language/Opcodes.kt

@@ -4,6 +4,10 @@ enum class Opcodes() {
     INIT_NS_FCALL_BY_NAME,
     INIT_FCALL,
     INIT_FCALL_BY_NAME,
+    FRAMELESS_ICALL_0,
+    FRAMELESS_ICALL_1,
+    FRAMELESS_ICALL_2,
+    FRAMELESS_ICALL_3,
     NEW,
     FETCH_CLASS_CONSTANT,
     FETCH_STATIC_PROP_R,

src/main/kotlin/com/github/xepozz/php_opcodes_language/language/reference/PHPOpReferenceContributor.kt

@@ -204,6 +204,39 @@ class PHPOpReferenceContributor : PsiReferenceContributor() {
             }
         )
 
+        registrar.registerReferenceProvider(
+            PlatformPatterns.psiElement(PHPOpParameter::class.java)
+                .withParent(
+                    PlatformPatterns.psiElement(PHPOpParenExpr::class.java)
+                        .withParent(
+                            PlatformPatterns.psiElement(PHPOpArgument::class.java)
+                                .withParent(
+                                    PlatformPatterns.psiElement(PHPOpInstruction::class.java)
+                                        .withName(
+                                            *arrayOf(
+                                                Opcodes.FRAMELESS_ICALL_0,
+                                                Opcodes.FRAMELESS_ICALL_1,
+                                                Opcodes.FRAMELESS_ICALL_2,
+                                                Opcodes.FRAMELESS_ICALL_3,
+                                            )
+                                                .map { it.name }
+                                                .toTypedArray(),
+                                        )
+                                )
+                        )
+                ),
+            object : PsiReferenceProvider() {
+                override fun getReferencesByElement(
+                    element: PsiElement,
+                    context: ProcessingContext
+                ): Array<out PsiReference> {
+                    println("PHPOpTypes.IDENTIFIER: ${element.text}")
+                    val functionName = element.text
+                    return arrayOf(PhpFunctionNameReference(element, functionName))
+                }
+            }
+        )
+
         registrar.registerReferenceProvider(
             PlatformPatterns.psiElement(PHPOpStringLiteral::class.java)
                 .withParent(