[RISCV] Remove forced-sw-shadow-stack in RISCVFeatures.td (llvm#115447)

This patch removes forced-sw-shadow-stack related statements in
RISCVFeatures.td, which was missed in the last patch
llvm#115355

Author: jaidTw

llvm/lib/Target/RISCV/RISCVFeatures.td

@@ -1461,8 +1461,3 @@ def FeatureTaggedGlobals : SubtargetFeature<"tagged-globals",
     "AllowTaggedGlobals",
     "true", "Use an instruction sequence for taking the address of a global "
     "that allows a memory tag in the upper address bits">;
-
-def FeatureForcedSWShadowStack : SubtargetFeature<
-    "forced-sw-shadow-stack", "HasForcedSWShadowStack", "true",
-    "Implement shadow stack with software.">;
-def HasForcedSWShadowStack : Predicate<"Subtarget->hasForcedSWShadowStack()">;