Apply feedback: nullptr MCExpr, remove superfluous memset

Author: JanekvO

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCKernelDescriptor.h

@@ -24,14 +24,14 @@ class MCContext;
 namespace AMDGPU {
 
 struct MCKernelDescriptor {
-  const MCExpr *group_segment_fixed_size;
-  const MCExpr *private_segment_fixed_size;
-  const MCExpr *kernarg_size;
-  const MCExpr *compute_pgm_rsrc3;
-  const MCExpr *compute_pgm_rsrc1;
-  const MCExpr *compute_pgm_rsrc2;
-  const MCExpr *kernel_code_properties;
-  const MCExpr *kernarg_preload;
+  const MCExpr *group_segment_fixed_size = nullptr;
+  const MCExpr *private_segment_fixed_size = nullptr;
+  const MCExpr *kernarg_size = nullptr;
+  const MCExpr *compute_pgm_rsrc3 = nullptr;
+  const MCExpr *compute_pgm_rsrc1 = nullptr;
+  const MCExpr *compute_pgm_rsrc2 = nullptr;
+  const MCExpr *kernel_code_properties = nullptr;
+  const MCExpr *kernarg_preload = nullptr;
 
   static void bits_set(const MCExpr *&Dst, const MCExpr *Value, uint32_t Shift,
                        uint32_t Mask, MCContext &Ctx);

llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp

@@ -1222,7 +1222,6 @@ MCKernelDescriptor getDefaultAmdhsaKernelDescriptor(const MCSubtargetInfo *STI,
   IsaVersion Version = getIsaVersion(STI->getCPU());
 
   MCKernelDescriptor KD;
-  memset(&KD, 0, sizeof(KD));
   const MCExpr *ZeroMCExpr = MCConstantExpr::create(0, Ctx);
   const MCExpr *OneMCExpr = MCConstantExpr::create(1, Ctx);