[clang] [llvm] [SPIRV] Add Target Builtins using Distance ext as an example (PR #121598)

[Nathan Gauër via cfe-commits]

================
@@ -20440,6 +20442,26 @@ Value *CodeGenFunction::EmitAMDGPUBuiltinExpr(unsigned 
BuiltinID,
   }
 }
 
+Value *CodeGenFunction::EmitSPIRVBuiltinExpr(unsigned BuiltinID,
+                                             const CallExpr *E) {
+  switch (BuiltinID) {
+  case SPIRV::BI__builtin_spirv_distance: {
+    Value *X = EmitScalarExpr(E->getArg(0));
+    Value *Y = EmitScalarExpr(E->getArg(1));
+    assert(E->getArg(0)->getType()->hasFloatingRepresentation() &&
+           E->getArg(1)->getType()->hasFloatingRepresentation() &&
+           "Distance operands must have a float representation");
+    assert(E->getArg(0)->getType()->isVectorType() &&
+           E->getArg(1)->getType()->isVectorType() &&
+           "Distance operands must be a vector");
+    return Builder.CreateIntrinsic(
+        /*ReturnType=*/X->getType()->getScalarType(), Intrinsic::spv_distance,
+        ArrayRef<Value *>{X, Y}, nullptr, "spv.distance");
+  }
+  }
+  return nullptr;
----------------
Keenuts wrote:

Shall an `llvm_unreachable()` be added?

https://github.com/llvm/llvm-project/pull/121598
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