remove unnecessary optimization for getindex(::Character, i) #441

Job	Run time
Julia 1.6 - ubuntu-latest - x64	6m 48s
Julia 1.6 - macOS-latest - x64	9m 15s
Julia 1.6 - windows-latest - x64	22m 51s
Julia 1 - ubuntu-latest - x64	9m 41s
Julia 1 - macOS-latest - x64	11m 19s
Julia 1 - windows-latest - x64	7m 52s
Julia nightly - ubuntu-latest - x64	8m 17s
Julia nightly - macOS-latest - x64	12m 2s
Julia nightly - windows-latest - x64	9m 53s
	1h 37m 58s

Provide feedback