[llvm] [GISel][RISCV]Implement indirect parameter passing (PR #95429)

[Craig Topper via llvm-commits]

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@@ -16,6 +16,586 @@
 ; Check that on RV32, i64 is passed in a pair of registers. Unlike
 ; the convention for varargs, this need not be an aligned pair.
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topperc wrote:

This comment applies to the `callee_i64_in_regs` function that is now after the new tests.

https://github.com/llvm/llvm-project/pull/95429