Use camel-case in FirFunctionCallOrigin

Also componentCall is operator call

compiler/testData/diagnostics/tests/modifiers/operatorInfix/Simple.fir.kt

@@ -1,45 +0,0 @@
-// !DIAGNOSTICS: -UNUSED_PARAMETER, -EXTENSION_SHADOWED_BY_MEMBER
-
-open class Example {
-    fun invoke() = 0
-    fun get(i: Int) = 0
-
-    fun component1() = 0
-    fun component2() = 0
-
-    fun inc() = Example()
-
-    fun plus(o: Example) = 0
-}
-
-class Example2 : Example()
-
-operator fun Example.invoke() = ""
-operator fun Example.get(i: Int) = ""
-
-operator fun Example.component1() = ""
-operator fun Example.component2() = ""
-
-operator fun Example.inc() = Example2()
-
-infix fun Example.plus(o: Example) = ""
-
-fun test() {
-    var a = Example()
-    val b = Example()
-
-    consumeString(a())
-    consumeString(a[1])
-
-    val (x, y) = Example()
-    consumeString(<!ARGUMENT_TYPE_MISMATCH!>x<!>)
-    consumeString(<!ARGUMENT_TYPE_MISMATCH!>y<!>)
-
-    consumeExample2(++a)
-
-    consumeString(a plus b)
-}
-
-fun consumeInt(i: Int) {}
-fun consumeString(s: String) {}
-fun consumeExample2(e: Example2) {}

compiler/testData/diagnostics/tests/modifiers/operatorInfix/Simple.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_PARAMETER, -EXTENSION_SHADOWED_BY_MEMBER
 
 open class Example {
@@ -42,4 +43,4 @@ fun test() {
 
 fun consumeInt(i: Int) {}
 fun consumeString(s: String) {}
-fun consumeExample2(e: Example2) {}
+fun consumeExample2(e: Example2) {}