[AMDGPU] Disable hasVALUPartialForwardingHazard for GFX12 (llvm#78188)

Author: jayfoad

llvm/lib/Target/AMDGPU/GCNSubtarget.h

@@ -1139,7 +1139,7 @@ class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
   bool hasLdsWaitVMSRC() const { return getGeneration() >= GFX12; }
 
   bool hasVALUPartialForwardingHazard() const {
-    return getGeneration() >= GFX11;
+    return getGeneration() == GFX11;
   }
 
   bool hasVALUTransUseHazard() const { return HasVALUTransUseHazard; }