[AMDGPU] Add a feature for VALUTransUseHazard

[foad]

Summary

NFCI. This just allows us to experiment with enabling/disabling the
workaround on different subtargets.

llvm/lib/Target/AMDGPU/AMDGPU.td

 def FeatureNSAMaxSize13 : SubtargetFeatureNSAMaxSize<13>;
 
 def FeatureVOPD : SubtargetFeature<"vopd",
   "HasVOPDInsts",
   "true",
   "Has VOPD dual issue wave32 instructions"
 >;
 
+def FeatureVALUTransUseHazard : SubtargetFeature<"valu-trans-use-hazard",
+  "HasVALUTransUseHazard",
+  "true",
+  "Hazard when TRANS instructions are closely followed by a use of the result"
+>;
+
 //===------------------------------------------------------------===//
 // Subtarget Features (options and debugging)
 //===------------------------------------------------------------===//
 
 class FeatureMaxPrivateElementSize<int size> : SubtargetFeature<
   "max-private-element-size-"#size,
   "MaxPrivateElementSize",
   !cast<string>(size),
def FeatureISAVersion11_Common : FeatureSet<
    FeatureShaderCyclesRegister,
    FeatureArchitectedFlatScratch,
    FeatureAtomicFaddRtnInsts,
    FeatureAtomicFaddNoRtnInsts,
    FeatureFlatAtomicFaddF32Inst,
    FeatureImageInsts,
    FeaturePackedTID,
    FeatureVcmpxPermlaneHazard,
+   FeatureVALUTransUseHazard,
    FeatureBackOffBarrier,
    FeatureMADIntraFwdBug]>;
 
 def FeatureISAVersion11_0_0 : FeatureSet<
   !listconcat(FeatureISAVersion11_Common.Features,
     [FeatureGFX11FullVGPRs,
      FeatureUserSGPRInit16Bug])>;
 

llvm/lib/Target/AMDGPU/GCNSubtarget.h

protected:
   bool HasNSAClauseBug = false;
   bool HasOffset3fBug = false;
   bool HasFlatSegmentOffsetBug = false;
   bool HasImageStoreD16Bug = false;
   bool HasImageGather4D16Bug = false;
   bool HasGFX11FullVGPRs = false;
   bool HasMADIntraFwdBug = false;
   bool HasVOPDInsts = false;
+  bool HasVALUTransUseHazard = false;
 
   // Dummy feature to use for assembler in tablegen.
   bool FeatureDisable = false;
 
   SelectionDAGTargetInfo TSInfo;
 private:
   SIInstrInfo InstrInfo;
   SITargetLowering TLInfo;
public:
   bool hasVOP3DPP() const { return getGeneration() >= GFX11; }
 
   bool hasLdsDirect() const { return getGeneration() >= GFX11; }
 
   bool hasVALUPartialForwardingHazard() const {
     return getGeneration() >= GFX11;
   }
 
-  bool hasVALUTransUseHazard() const { return getGeneration() >= GFX11; }
+  bool hasVALUTransUseHazard() const { return HasVALUTransUseHazard; }
 
   bool hasVALUMaskWriteHazard() const { return getGeneration() >= GFX11; }
 
   /// Return if operations acting on VGPR tuples require even alignment.
   bool needsAlignedVGPRs() const { return GFX90AInsts; }
 
   /// Return true if the target has the S_PACK_HL_B32_B16 instruction.
   bool hasSPackHL() const { return GFX11Insts; }