[compiler-rt] r196480 - [sanitizer] support toolchains that don't understand CFI directives

[Rafael Espíndola]

> +#if defined(__clang__) ||                                                      \
> +    (defined(__GNUC__) && defined(__GCC_HAVE_DWARF2_CFI_ASM))
> +  // GCC defined __GCC_HAVE_DWARF2_CFI_ASM if it supports CFI.

Should we change clang to define  __GCC_HAVE_DWARF2_CFI_ASM too?

Cheers,
Rafael