[SYCL] Rename TARGET_TRIPLE to LLVM_TARGET_TRIPLE

Required after this change done in LLVM upstream:

   commit 0c0f6cf
   Author: Petr Hosek <[email protected]>

   [CMake] Rename TARGET_TRIPLE to LLVM_TARGET_TRIPLE

   This clarifies that this is an LLVM specific variable and avoids
   potential conflicts with other projects.

   Differential Revision: https://reviews.llvm.org/D119918

Can be observed as:
lit.py: /usr/lib/llvm-15/build/utils/lit/lit/llvm/config.py:304: fatal:
Could not turn '' into Itanium ABI triple

Author: Pavel V Chupin

libclc/test/lit.site.cfg.py.in

@@ -10,7 +10,7 @@ config.llvm_shlib_dir = "@SHLIBDIR@"
 config.llvm_plugin_ext = "@LLVM_PLUGIN_EXT@"
 config.lit_tools_dir = "@LLVM_LIT_TOOLS_DIR@"
 config.host_triple = "@LLVM_HOST_TRIPLE@"
-config.target_triple = "@TARGET_TRIPLE@"
+config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.host_arch = "@HOST_ARCH@"
 config.python_executable = "@PYTHON_EXECUTABLE@"
 config.libclc_root = "@LIBCLC_ROOT_DIR@"

sycl/test/Unit/lit.site.cfg.py.in

@@ -10,7 +10,7 @@ config.llvm_build_mode = "@LLVM_BUILD_MODE@"
 config.clang_obj_root = "@CLANG_BINARY_DIR@"
 config.enable_shared = @ENABLE_SHARED@
 config.shlibdir = "@SHLIBDIR@"
-config.target_triple = "@TARGET_TRIPLE@"
+config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.sycl_obj_root = "@SYCL_BINARY_DIR@"
 config.sycl_coverage_path = "@SYCL_COVERAGE_PATH@"
 

sycl/test/lit.site.cfg.py.in

@@ -9,7 +9,7 @@ config.sycl_include = lit_config.params.get('SYCL_INCLUDE', "@SYCL_INCLUDE@")
 config.sycl_obj_root = "@SYCL_BINARY_DIR@"
 config.sycl_source_dir = "@SYCL_SOURCE_DIR@/source"
 config.sycl_libs_dir = lit_config.params.get('SYCL_LIBS_DIR', "@LLVM_LIBS_DIR@")
-config.target_triple = "@TARGET_TRIPLE@"
+config.target_triple = "@LLVM_TARGET_TRIPLE@"
 config.host_triple = "@LLVM_HOST_TRIPLE@"
 config.opencl_libs_dir = os.path.dirname("@OpenCL_LIBRARIES@")
 config.opencl_include_dir = "@OpenCL_INCLUDE_DIR@"