Optimize ConstraintInjector::isMyTypeVariable

Do not look into the map for constructors that are not
type variables

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/ConeInferenceContext.kt

@@ -246,6 +246,11 @@ interface ConeInferenceContext : TypeSystemInferenceExtensionContext,
         return this.typeConstructor
     }
 
+    override fun KotlinTypeMarker.mayBeTypeVariable(): Boolean {
+        require(this is ConeKotlinType)
+        return this is ConeTypeVariableType
+    }
+
     override fun CapturedTypeMarker.typeConstructorProjection(): TypeArgumentMarker {
         require(this is ConeCapturedType)
         return this.constructor.projection
@@ -310,4 +315,4 @@ interface ConeInferenceContext : TypeSystemInferenceExtensionContext,
     override fun TypeConstructorMarker.isCapturedTypeConstructor(): Boolean {
         return this is ConeCapturedTypeConstructor
     }
-}
+}