fix: allow override opt dbg and fastbuild flags (#363)

The order was correct in the clang toolchain config.
Setting this order allow user compile flags like copts attribute
to come after the copts from the ones expanded by the opt, dbg
and fastbuild features.

Author: cerisier

cuda/private/toolchain_configs/nvcc.bzl

@@ -531,13 +531,13 @@ def _impl(ctx):
         host_compiler_feature,
         supports_compiler_device_link_feature,
         include_paths_feature,
+        dbg_feature,
+        opt_feature,
+        fastbuild_feature,
         defines_feature,
         host_defines_feature,
         compile_flags_feature,
         host_compile_flags_feature,
-        dbg_feature,
-        opt_feature,
-        fastbuild_feature,
         sysroot_feature,
         ptxas_flags_feature,
         compiler_input_flags_feature,

cuda/private/toolchain_configs/nvcc_msvc.bzl

@@ -571,13 +571,13 @@ def _impl(ctx):
         arch_all_major_feature,
         default_compile_flags_feature,
         include_paths_feature,
+        dbg_feature,
+        opt_feature,
+        fastbuild_feature,
         defines_feature,
         host_defines_feature,
         compile_flags_feature,
         host_compile_flags_feature,
-        dbg_feature,
-        opt_feature,
-        fastbuild_feature,
         generate_pdb_file_feature,
         frame_pointer_feature,
         static_link_msvcrt_debug_feature,