[llvm] [RISCV] Add assembler support to lower `la/lla` to `qc.e.li` (PR #205782)

[Craig Topper via llvm-commits]

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topperc wrote:

Need braces on the `else` to match the `if`. Or drop braces from the `if`

https://github.com/llvm/llvm-project/pull/205782