745224e0 gcc-4.9 emmintrin.h build error

The changes in 745224e0 don't seem to build here with gcc-4.9 on linux x64_64. Any idea what's wrong?

    CC credential-store.o
In file included from /usr/lib/.../xmmintrin.h:31:0,
                 from /usr/lib/.../emmintrin.h:31,
                 from git-compat-util.h:708,
                 from cache.h:4,
                 from credential-store.c:1:
/usr/lib/.../mmintrin.h: In function '_mm_cvtsi32_si64':
/usr/lib/.../mmintrin.h:64:3: error: can't convert between vector
values of different size
   return (__m64) __builtin_ia32_vec_init_v2si (__i, 0);
   ^
/usr/lib/.../mmintrin.h: In function '_mm_cvtsi64_si32':
/usr/lib/.../mmintrin.h:107:10: error: incompatible type for argument
1 of '__builtin_ia32_vec_ext_v2si'
   return __builtin_ia32_vec_ext_v2si ((__v2si)__i, 0);
          ^

[...]

In file included from /usr/lib/.../emmintrin.h:31:0,
                 from git-compat-util.h:708,
                 from cache.h:4,
                 from credential-store.c:1:
/usr/lib/.../xmmintrin.h: In function '_mm_add_ss':
/usr/lib/.../xmmintrin.h:127:19: error: incompatible type for argument
1 of '__builtin_ia32_addss'
   return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);
                   ^
/usr/lib/.../xmmintrin.h:127:3: note: expected '__vector(4) float' but
argument is of type '__m128'
   return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);
   ^
/usr/lib/.../xmmintrin.h:127:19: error: incompatible type for argument
2 of '__builtin_ia32_addss'
   return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);

                   ^

[...]

/usr/lib/.../emmintrin.h:1455:3: error: incompatible type for argument
2 of '__builtin_ia32_movntpd'
   __builtin_ia32_movntpd (__A, (__v2df)__B);
   ^
/usr/lib/.../emmintrin.h:1455:3: note: expected '__vector(2) double'
but argument is of type '__m128d'
Makefile:1983: recipe for target 'credential-store.o' failed
make: *** [credential-store.o] Error 1