message: [XLA:GPU] Make (r)sqrt emission look through explicit broadcasts.
  Found by inspection, performance seems neutral.
diff: @@ -53,11 +53,17 @@ using llvm_ir::IrName;
  using llvm_ir::SetToFirstInsertPoint;
  using tensorflow::strings::StrAppend;
  +namespace {
  // Returns whether operand is a floating-point literal with the given value.
  bool IsFPLiteralWithValue(const HloInstruction* operand, float value) {
  - return operand->opcode() == HloOpcode::kConstant &&
  - operand->literal().IsAllFloat(value);
  + if (operand->opcode() == HloOpcode::kConstant &&
  + operand->literal().IsAllFloat(value)) {
  + return true;
  }
  + return operand->opcode() == HloOpcode::kBroadcast &&
  + IsFPLiteralWithValue(operand->operand(0), value);
  +}
  +} // namespace
  GpuElementalIrEmitter::GpuElementalIrEmitter(
  const HloModuleConfig& hlo_module_config, llvm::Module* module,
  