Currently there is only support for VCC_LO as a scalar source. Add support for VCC_HI as well. The op selector symbol is also changed to be vcc_hi/vcc_lo as it is in disassembly from LLVM. Change-Id: I19ea8e23873049c33ffe2eb4ec8504a18f371c0e Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/61329 Reviewed-by: Matt Sinclair <mattdsinclair.wisc@gmail.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Maintainer: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>