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[RISCV] Support mutilib in baremetal environment

Authored by khchen on Nov 21 2019, 1:12 AM.

Description

[RISCV] Support mutilib in baremetal environment

  1. Currently only support the set of multilibs same to riscv-gnu-toolchain.
  2. Fix testcase typo causes fail on Windows.
  3. Fix testcases to set empty sysroot.

Reviewers: espindola, asb, kito-cheng, lenary

Reviewed By: lenary

Differential Revision: https://reviews.llvm.org/D67508