[Clang] __has_builtin should return false for aux triple builtins (#121839) Currently, `__has_builtin` will return true when passed a builtin that is only supported on the aux target. I found this when `__has_builtin` was called with an X86 builtin but the current target was SPIR-V. We should instead return false for aux builtins. --------- Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
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