Support RISC-V unaligned-scalar-mem target feature

This adds `unaligned-scalar-mem` as an allowed RISC-V target feature.
Some RISC-V cores support unaligned access to memory without trapping.
On such cores, the compiler could significantly improve code-size and
performance when using functions like core::ptr::read_unaligned<u32>
by emitting a single load or store instruction with an unaligned
address, rather than a long sequence of byte load/store/bitmanip
instructions.

Enabling the `unaligned-scalar-mem` target feature allows LLVM to do
this optimization.

Fixes #110883

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