[PATCH] D117975: [JITLink][RISCV] fix the extractBits behavior and add R_RISCV_JAL relocation.

[Siwei Zhang via Phabricator via llvm-commits]

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This patch supports the R_RISCV_JAL relocation.
Moreover, it will fix the extractBits function's behavior as it extracts Size + 1 bits.
In the test ELF_jal.s: 
Before:

  Hi: 4294836480
  extractBits(Hi, 12, 8): 480

After:

  Hi: 4294836480
  extractBits(Hi, 12, 8): 224


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D117975

Files:
  llvm/include/llvm/ExecutionEngine/JITLink/riscv.h
  llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
  llvm/lib/ExecutionEngine/JITLink/riscv.cpp
  llvm/test/ExecutionEngine/JITLink/RISCV/ELF_jal.s

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