[FIR2IR] Rename entrypoint function of Fir2IrConverter

Originally it was named createModuleFragmentWithSignaturesIfNeeded, because
  there was a counterpart `...WithoutSignatures`. Now that function has
  gone and there is only one entrypoint left

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirCompilerFacility.kt

@@ -147,7 +147,7 @@ internal class KtFirCompilerFacility(
             allowNonCachedDeclarations = true
         )
 
-        val fir2IrResult = Fir2IrConverter.createModuleFragmentWithSignaturesIfNeeded(
+        val fir2IrResult = Fir2IrConverter.createIrModuleFragment(
             rootModuleSession,
             firResolveSession.getScopeSessionFor(rootModuleSession),
             firFilesToCompile,

compiler/fir/entrypoint/src/org/jetbrains/kotlin/fir/pipeline/convertToIr.kt

@@ -45,7 +45,7 @@ data class ModuleCompilerAnalyzedOutput(
         visibilityConverter: Fir2IrVisibilityConverter,
         kotlinBuiltIns: KotlinBuiltIns,
     ): Fir2IrResult {
-        return Fir2IrConverter.createModuleFragmentWithSignaturesIfNeeded(
+        return Fir2IrConverter.createIrModuleFragment(
             session, scopeSession, fir,
             fir2IrExtensions, fir2IrConfiguration,
             irMangler, IrFactoryImpl, visibilityConverter,

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrConverter.kt

@@ -530,7 +530,7 @@ class Fir2IrConverter(
             }
         }
 
-        fun createModuleFragmentWithSignaturesIfNeeded(
+        fun createIrModuleFragment(
             session: FirSession,
             scopeSession: ScopeSession,
             firFiles: List<FirFile>,