[Transform][BUG] fix gc-check fail on creating arith pass (#157)

* fix gc-check fail on create arith pass

* update

Author: Ivy Zhang

lib/gc/Transforms/Pipeline.cpp

@@ -56,7 +56,8 @@ void populateVectorPasses(mlir::PassManager &pm) {
   pm.addNestedPass<func::FuncOp>(math::createMathLegalizeToF32());
   // sourceTypeStrs can be extended
   arith::ArithEmulateUnsupportedFloatsOptions options;
-  options.sourceTypeStrs = {"bf16"};
+  const static std::string strType = "bf16";
+  options.sourceTypeStrs = {&strType, 1};
   options.targetTypeStr = "f32";
   pm.addNestedPass<func::FuncOp>(
       arith::createArithEmulateUnsupportedFloats(options));