FE: forbid extension calls on inline functional parameters

Extension receivers are currently implicitly noinline, and changing that
would require modifying the syntax to allow marking them noinline or
crossinline.

^KT-5837 Open
^KT-25787 Fixed
^KT-47965 Fixed
^KT-50107 Fixed
^KT-52403 Fixed

compiler/testData/diagnostics/tests/inline/binaryExpressions/assignment.kt

@@ -1,10 +1,11 @@
+// FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_PARAMETER -UNUSED_VARIABLE -NOTHING_TO_INLINE -ASSIGNED_BUT_NEVER_ACCESSED_VARIABLE -UNUSED_VALUE -NON_LOCAL_RETURN_NOT_ALLOWED
 
 operator fun <T, U> Function1<T, U>.minusAssign(p: Function1<T, U>) {}
 
 inline <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun <T, U> Function1<T, U>.modAssign(p: Function1<T, U>) = {
     this += p
-    p += this
+    <!USAGE_IS_NOT_INLINABLE!>p<!> += this
 }
 
 inline operator fun <T, U> Function1<T, U>.plusAssign(p: Function1<T, U>) {
@@ -16,7 +17,7 @@ operator fun <T, U, V> @ExtensionFunctionType Function2<T, U, V>.minusAssign(ext
 
 inline <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun <T, U, V> @ExtensionFunctionType Function2<T, U, V>.modAssign(ext : @ExtensionFunctionType Function2<T, U, V>) = {
     this += ext
-    ext += this
+    <!USAGE_IS_NOT_INLINABLE!>ext<!> += this
 }
 
 inline operator fun <T, U, V> @ExtensionFunctionType Function2<T, U, V>.plusAssign(ext : @ExtensionFunctionType Function2<T, U, V>) {
@@ -25,6 +26,6 @@ inline operator fun <T, U, V> @ExtensionFunctionType Function2<T, U, V>.plusAssi
 }
 
 inline fun <T, U, V> inlineFunWithInvoke(s: (p: T) -> U, ext: T.(p: U) -> V) {
-    s += s
-    ext += ext
+    <!USAGE_IS_NOT_INLINABLE!>s<!> += s
+    <!USAGE_IS_NOT_INLINABLE!>ext<!> += ext
 }