[tests] Fix an invalidation test in the precompile testset (extracted out of #59413) (#59879)

Fixes #59846
Extracted out of #59413

Author: DilumAluthge

test/precompile.jl

@@ -1123,9 +1123,9 @@ precompile_test_harness("code caching") do dir
         if invalidations[idxv-1].def.def.name === :getproperty
             idxv = findnext(==("verify_methods"), invalidations, idxv+1)
         end
-        @test invalidations[idxv-1].def.def.name === :flbi
-        idxv = findnext(==("verify_methods"), invalidations, idxv+1)
-        @test invalidations[idxv-1].def.def.name === :useflbi
+        idxv = findnext(==(invalidations[idxv-1]), invalidations, idxv+1)
+        @test invalidations[idxv-1] == "verify_methods"
+        @test invalidations[idxv-2].def.def.name === :useflbi
 
         m = only(methods(MB.map_nbits))
         @test !hasvalid(m.specializations::Core.MethodInstance, world+1) # insert_backedges invalidations also trigger their backedges