[LLVMdev] a document bug in lib/CodeGen/README.txt

[Baoshan Pang]

I think I found a bug in lib/CodeGen/README.txt:

The register "lr" should be "r4" in instruction "str lr, [sp, #+52]" of :

and then "merge" mul and mov:
>         mul r4, r4, lr
>         str lr, [sp, #+52]
>         ldr lr, [r1, #+32]
>         sxth r3, r3
>         mla r4, r3, lr, r4
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