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Initial support for RISC-V (#56105)

Rebase and extension of @alexfanqi's initial work on porting Julia to
RISC-V. Requires LLVM 19.

Tested on a VisionFive2, built with:

```make
MARCH := rv64gc_zba_zbb
MCPU := sifive-u74

USE_BINARYBUILDER:=0

DEPS_GIT = llvm
override LLVM_VER=19.1.1
override LLVM_BRANCH=julia-release/19.x
override LLVM_SHA1=julia-release/19.x
```

```julia-repl
❯ ./julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.12.0-DEV.1374 (2024-10-14)
 _/ |\__'_|_|_|\__'_|  |  riscv/25092a3982* (fork: 1 commits, 0 days)
|__/                   |

julia> versioninfo(; verbose=true)
Julia Version 1.12.0-DEV.1374
Commit 25092a3982* (2024-10-14 09:57 UTC)
Platform Info:
  OS: Linux (riscv64-unknown-linux-gnu)
  uname: Linux 6.11.3-1-riscv64 #1 SMP Debian 6.11.3-1 (2024-10-10) riscv64 unknown
  CPU: unknown:
              speed         user         nice          sys         idle          irq
       #1  1500 MHz        922 s          0 s        265 s     160953 s          0 s
       #2  1500 MHz        457 s          0 s        280 s     161521 s          0 s
       #3  1500 MHz        452 s          0 s        270 s     160911 s          0 s
       #4  1500 MHz        638 s         15 s        301 s     161340 s          0 s
  Memory: 7.760246276855469 GB (7474.08203125 MB free)
  Uptime: 16260.13 sec
  Load Avg:  0.25  0.23  0.1
  WORD_SIZE: 64
  LLVM: libLLVM-19.1.1 (ORCJIT, sifive-u74)
Threads: 1 default, 0 interactive, 1 GC (on 4 virtual cores)
Environment:
  HOME = /home/tim
  PATH = /home/tim/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
  TERM = xterm-256color


julia> ccall(:jl_dump_host_cpu, Nothing, ())
CPU: sifive-u74
Features: +zbb,+d,+i,+f,+c,+a,+zba,+m,-zvbc,-zksed,-zvfhmin,-zbkc,-zkne,-zk... (continued)

77025 of 89099 relevant lines covered (86.45%)

15882373.46 hits per line

Source Files on job #37934.1