Use the iree toolchain to build riscv-tests
Use the iree toolchain to build riscv-tests

libgcc from the gcc toolchain includes c-ext instructions which springbok
doesn't support.

Change-Id: Ie9c01abc6398564f8998f5c7a3fe2594ee1693a8
GitOrigin-RevId: 6f90deaa19cc4c742f57fd01b77214d5e9e4ac82

AmbiML/sparrow-build