[llvm] [RISCV] Add short forward branch support for `lb`, `lbu`, `lh`, `lhu`, `lw`, `lwu` and `ld` (PR #170829)

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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hchandel wrote:

Combined these five tests into two tests. Please have a look.

https://github.com/llvm/llvm-project/pull/170829