[llvm] [RISCV] Use TableGen-based macro fusion (PR #72224)

[Craig Topper via llvm-commits]

================
@@ -200,6 +200,7 @@ def SiFive7Model : SchedMachineModel {
                              HasStdExtZcmt, HasStdExtZknd, HasStdExtZkne,
                              HasStdExtZknh, HasStdExtZksed, HasStdExtZksh,
                              HasStdExtZkr];
+  let MacroFusions = [LUIADDI];
----------------
topperc wrote:

SiFive7 doesn't implement any macrofusions. Is there some other way we can test?

https://github.com/llvm/llvm-project/pull/72224