Fix file paths in test_compiler (#2523)

Add a command line argument to override the SPIR-V file paths if needed,
similar to `test_spirv_new`. Set the default path to the one required by
`run_conformance.py`, which assumes the current working directory to be
`<build_dir>/test_conformance`.

Signed-off-by: Ahmed Hesham <ahmed.hesham@arm.com>

test_conformance/compiler/test_unload_platform_compiler.cpp

@@ -32,8 +32,6 @@ const std::string slash = "\\";
 #else
 const std::string slash = "/";
 #endif
-std::string compilerSpvBinaries = "test_conformance" + slash + "compiler"
-    + slash + "spirv_bin" + slash + "write_kernel.spv";
 
 const std::string spvExt = ".spv";
 
@@ -338,8 +336,8 @@ public:
 
         std::vector<unsigned char> kernel_buffer;
 
-        std::string file_name =
-            compilerSpvBinaries + std::to_string(address_bits);
+        std::string file_name = spvBinariesPath + slash + "write_kernel.spv"
+            + std::to_string(address_bits);
         m_spirv_binary = readBinary(file_name.c_str());
         m_spirv_size = m_spirv_binary.size();
     }