Fix #751 for floating point coverage
Fix #751 for floating point coverage

the form for <instr> <reg> <imm>(<reg>) is changed, updated accordingly

Signed-off-by: Weicai Yang <4fa8c7762ee4da95e3dee7dae2c3263ea16637f9@google.com>

google/riscv-dv,google/riscv-dv,google/riscv-dv