Remove unused PHASE_COMPUTE_PREDS (#81863)

Author: BruceForstall

src/coreclr/jit/compphases.h

@@ -40,7 +40,6 @@ CompPhaseNameMacro(PHASE_EMPTY_FINALLY,              "Remove empty finally",
 CompPhaseNameMacro(PHASE_MERGE_FINALLY_CHAINS,       "Merge callfinally chains",       false, -1, false)
 CompPhaseNameMacro(PHASE_CLONE_FINALLY,              "Clone finally",                  false, -1, false)
 CompPhaseNameMacro(PHASE_UPDATE_FINALLY_FLAGS,       "Update finally target flags",    false, -1, false)
-CompPhaseNameMacro(PHASE_COMPUTE_PREDS,              "Compute preds",                  false, -1, false)
 CompPhaseNameMacro(PHASE_EARLY_UPDATE_FLOW_GRAPH,    "Update flow graph early pass",   false, -1, false)
 CompPhaseNameMacro(PHASE_STR_ADRLCL,                 "Morph - Structs/AddrExp",        false, -1, false)
 CompPhaseNameMacro(PHASE_EARLY_LIVENESS,             "Early liveness",                 false, -1, false)