Bug in C ABI when using large function signature with a struct

print_ll.sh

clang -DMain -S -emit-llvm test.c && mv test{,.c}.ll

crystal build --prelude=empty --no-debug --emit=llvm-ir test.cr && mv test{,.cr}.ll

run.cmd

cl /c test.c /Fotest.o && crystal test.cr

run.sh

gcc -c test.c && crystal test.cr

test.c

#include <stdio.h>

typedef struct Vec {
    long long x;
    long long y;
} Vec;

void foo(long long a, long long b, long long c, long long d, long long e, Vec v) {
    printf("%lld %lld %lld %lld %lld %lld %lld\n", a, b, c, d, e, v.x, v.y);
    // 1 2 3 4 5 7 139713085455776
}

#ifdef Main
int main() {
    Vec v = {6, 7};
    foo(1, 2, 3, 4, 5, v);
}
#endif

test.cr

@[Link(ldflags: "#{__DIR__}/test.o")]
lib Lib
  struct Vec
    x : Int64
    y : Int64
  end

  fun foo(Int64, Int64, Int64, Int64, Int64, Vec)
end

Lib.foo(1, 2, 3, 4, 5, Lib::Vec.new(x: 6, y: 7))