Revert accidental commits.

Revert "[RISCV] get toolchain path from enviroment variable"
This reverts commit f9af83f302b397d59361f0dd72f2b55171535901.

Revert "[RISCV] Add a toolchain file for RISC-V."
This reverts commit 8141fe6213d911f469f92bfe5f8a85672f9d8a3d.

Revert "[HACK] Disable matrix_types tests."
This reverts commit a9efc190f2a5c0735562c014211bfce35706d5bd.
2 files changed