Kill warnings from function/TesnorShapeTest.cpp
Created by: wangkuiyi
[15:47:49] : [Step 1/1] [ 79%] Building CXX object paddle/function/CMakeFiles/TensorShapeTest.dir/TensorShapeTest.cpp.o
[15:47:50]W: [Step 1/1] In file included from /paddle/paddle/function/TensorShapeTest.cpp:16:0:
[15:47:50]W: [Step 1/1] /paddle/build/third_party/install/gtest/include/gtest/gtest.h: In instantiation of 'testing::AssertionResult testing::internal::CmpHelperEQ(const char*, const char*, const T1&, const T2&) [with T1 = long unsigned int; T2 = int]':
[15:47:50]W: [Step 1/1] /paddle/build/third_party/install/gtest/include/gtest/gtest.h:1421:23: required from 'static testing::AssertionResult testing::internal::EqHelper<lhs_is_null_literal>::Compare(const char*, const char*, const T1&, const T2&) [with T1 = long unsigned int; T2 = int; bool lhs_is_null_literal = false]'
[15:47:50]W: [Step 1/1] /paddle/paddle/function/TensorShapeTest.cpp:47:3: required from here
[15:47:50]W: [Step 1/1] /paddle/build/third_party/install/gtest/include/gtest/gtest.h:1392:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]