cmake HAVE_X86_64_ASM examples

bitcoin-core/secp256k1 cmake/CheckX86_64Assembly.cmake :4

check_c_source_compiles("
    #include <stdint.h>

    int main()
    {
      uint64_t a = 11, tmp;
      __asm__ __volatile__(\"movq $0x100000000,%1; mulq %%rsi\" : \"+a\"(a) : \"S\"(tmp) : \"cc\", \"%rdx\");
    }
  " HAVE_X86_64_ASM)

bitcoin-sv/bitcoin-sv src/secp256k1/cmake/CheckX86_64Assembly.cmake :4

check_c_source_compiles("
    #include <stdint.h>

    int main()
    {
      uint64_t a = 11, tmp;
      __asm__ __volatile__(\"movq $0x100000000,%1; mulq %%rsi\" : \"+a\"(a) : \"S\"(tmp) : \"cc\", \"%rdx\");
    }
  " HAVE_X86_64_ASM)

coinbase/cb-mpc vendors/secp256k1/cmake/CheckX86_64Assembly.cmake :4

check_c_source_compiles("
    #include <stdint.h>

    int main()
    {
      uint64_t a = 11, tmp;
      __asm__ __volatile__(\"movq $0x100000000,%1; mulq %%rsi\" : \"+a\"(a) : \"S\"(tmp) : \"cc\", \"%rdx\");
    }
  " HAVE_X86_64_ASM)