gtest: cmake: add workaround for ICC bug in backward_data and backward_weights tests

	test cases that trigger exceptions are mishandled by Intel Compiler 19.1
	and result in error/exit-code 0x01. This patch prevents the compiler from
	optimizing the code.

Author: msotoflo

tests/gtests/CMakeLists.txt

@@ -91,6 +91,8 @@ file(GLOB PRIM_TEST_CASES_SRC
 if(WIN32 AND ${CMAKE_CXX_COMPILER_ID} STREQUAL "Intel")
     set_source_files_properties(
             test_convolution_eltwise_forward_x8s8f32s32.cpp
+            test_convolution_backward_data_f32.cpp
+            test_convolution_backward_weights_f32.cpp
             PROPERTIES COMPILE_FLAGS "/O1")
 endif()