[DirectX backend] emit metadata for DXIL version

[python3kgae]

Summary

New named metadata created with name "dx.version".
The content is shader model major - 5 and shader model minor.
sm6.0 will get dxil version 1.0.
sm6.6 will get dxil version 6.6.

[python3kgae]

Fix clang-format missed by arc lint.

[python3kgae]

Squash 2 commits.

[beanz]

llvm/lib/Target/DirectX/DXILMetadata.h

35 ↗

(On Diff #488987)

Since these are unrelated metadata entries, it makes more sense to do them in separate methods.

llvm/lib/Target/DirectX/DXILMetadata.cpp

void dxil::createShaderModelAndDXILVersionMD(Module &M) {
   IRBuilder<> B(Ctx);
 
   Metadata *Vals[3];
   Vals[0] = MDString::get(Ctx, getShortShaderStage(TT.getEnvironment()));
   Vals[1] = ConstantAsMetadata::get(B.getInt32(Ver.getMajor()));
   Vals[2] = ConstantAsMetadata::get(B.getInt32(Ver.getMinor().value_or(0)));
   Entry->addOperand(MDNode::get(Ctx, Vals));
 
-  // DXIL Version is just shader model major - 5. sm6.0-> dxil version 1.0.  
+  // DXIL Version is just shader model major - 5. sm6.0-> dxil version 1.0.
   NamedMDNode *DXILVerEntry = M.getOrInsertNamedMetadata("dx.version");
   Metadata *DXILVerVals[2];
   DXILVerVals[0] = ConstantAsMetadata::get(B.getInt32(Ver.getMajor() - 5));
-  DXILVerVals[1] = ConstantAsMetadata::get(B.getInt32(Ver.getMinor().value_or(0)));
+  DXILVerVals[1] =
+      ConstantAsMetadata::get(B.getInt32(Ver.getMinor().value_or(0)));
   DXILVerEntry->addOperand(MDNode::get(Ctx, DXILVerVals));
 }
 
 static uint32_t getShaderStage(Triple::EnvironmentType Env) {
   return (uint32_t)Env - (uint32_t)llvm::Triple::Pixel;
 }
 
 namespace {