[X86][AVX512] Rename avx512popcntdq intrinsics tests files to match *-builtins.c...

diff --git a/clang/test/CodeGen/X86/avx512vpopcntdqintrin.c b/clang/test/CodeGen/X86/avx512vpopcntdq-builtins.c
similarity index 100%
rename from clang/test/CodeGen/X86/avx512vpopcntdqintrin.c
rename to clang/test/CodeGen/X86/avx512vpopcntdq-builtins.c

diff --git a/clang/test/CodeGen/X86/avx512vpopcntdqvlintrin.c b/clang/test/CodeGen/X86/avx512vpopcntdqvl-builtins.c
similarity index 100%
rename from clang/test/CodeGen/X86/avx512vpopcntdqvlintrin.c
rename to clang/test/CodeGen/X86/avx512vpopcntdqvl-builtins.c