printf is incorrectly testing vector arguments

[coldav]

#2019 added multiple vector tests including:

float3 tmp = (float3)(1234.25f,987654.5f,0.0005f); printf("%.2v3e\n",tmp);}

This does not include a length specifier. The spec says that "If a vector specifier appears without a length modifier, the behaviour is undefined. "

There are a few others like this.

[bashbaug]

Should we revert #2019 while we get this worked out? CC @shajder

[svenvh]

Alternatively (to a revert), I think this should fix the vector test too: #2044

[shajder]

Alternatively (to a revert), I think this should fix the vector test too: #2044

@svenvh is there anything more to do around this issue ?

[svenvh]

If #2044 gets merged I believe we can close this issue.