Quick fix for a waning in clang_rt.ctx_profile [-Wgnu-anonymous-struct]

`__sanitizer_siginfo` has been introduced in D142117.
(llvmorg-16-init-17950-ged9ef9b4f248)
It is incompatible to -pedantic.

`clang_rt.ctx_profile` has been introduced in #92456.

Author: chapuni

compiler-rt/cmake/config-ix.cmake

@@ -127,6 +127,7 @@ check_cxx_compiler_flag("-Werror -Wframe-larger-than=512" COMPILER_RT_HAS_WFRAME
 check_cxx_compiler_flag("-Werror -Wglobal-constructors"   COMPILER_RT_HAS_WGLOBAL_CONSTRUCTORS_FLAG)
 check_cxx_compiler_flag("-Werror -Wc99-extensions"     COMPILER_RT_HAS_WC99_EXTENSIONS_FLAG)
 check_cxx_compiler_flag("-Werror -Wgnu"                COMPILER_RT_HAS_WGNU_FLAG)
+check_cxx_compiler_flag("-Werror -Wgnu-anonymous-struct" COMPILER_RT_HAS_WGNU_ANONYMOUS_STRUCT_FLAG)
 check_cxx_compiler_flag("-Werror -Wvariadic-macros"    COMPILER_RT_HAS_WVARIADIC_MACROS_FLAG)
 check_cxx_compiler_flag("-Werror -Wunused-parameter"   COMPILER_RT_HAS_WUNUSED_PARAMETER_FLAG)
 check_cxx_compiler_flag("-Werror -Wcovered-switch-default" COMPILER_RT_HAS_WCOVERED_SWITCH_DEFAULT_FLAG)

compiler-rt/lib/ctx_profile/CMakeLists.txt

@@ -15,6 +15,9 @@ include_directories(../../include)
 # We don't use the C++ Standard Library here, so avoid including it by mistake.
 append_list_if(COMPILER_RT_HAS_NOSTDINCXX_FLAG -nostdinc++ EXTRA_FLAGS)
 
+# __sanitizer_siginfo
+append_list_if(COMPILER_RT_HAS_WGNU_ANONYMOUS_STRUCT_FLAG -Wno-gnu-anonymous-struct EXTRA_FLAGS)
+
 if(COMPILER_RT_INCLUDE_TESTS)
   add_subdirectory(tests)
 endif()