Revert "Unicode: Force-inline isgraphemebreak! (#58674)"

This reverts commit 47ebf95.

Author: DilumAluthge

stdlib/Unicode/test/runtests.jl

@@ -284,8 +284,6 @@ end
     @test_throws BoundsError graphemes("äöüx", 2:5)
     @test_throws BoundsError graphemes("äöüx", 5:5)
     @test_throws ArgumentError graphemes("äöüx", 0:1)
-
-    @test @allocated(length(graphemes("äöüx"))) == 0
 end
 
 @testset "#3721, #6939 up-to-date character widths" begin