[flang] Allow flexible name in llvm.ident (NFC) (#104543)

Author: kkwli

flang/test/Lower/ident.f90

@@ -2,4 +2,4 @@
 ! RUN: %flang_fc1 -emit-fir %s -o - | FileCheck %s
 
 ! CHECK: module attributes {
-! CHECK-SAME: llvm.ident = "flang version {{.+}}"
+! CHECK-SAME: llvm.ident = "{{.*}}flang version {{.+}}"