[clang][Driver][SPIR-V] Make tool names consistent (#122343)
Some use `SPIRV` and some use `SPIR-V`, just use `SPIR-V` which is what
we use normally.
I noticed this when fixing the test in
https://github.com/llvm/llvm-project/pull/122310.
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>