[Bug target/66275] __attribute__((sysv_abi)) with x86_64-w64-mingw32-gcc generates incorrect code

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66275

--- Comment #4 from Uroš Bizjak <ubizjak at gmail dot com> ---
Created attachment 35670
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35670&action=edit
Proposed patch

Patch that fixes ix86_function_arg_regno_p and ix86_function_value_regno_p to
follow the ABI attribute.