i965/fs: fix 32-bit data type to int64 conversion on BSW/BXT
i965/fs: fix 32-bit data type to int64 conversion on BSW/BXT

The 32-bit to 64-bit conversions need to have the 32-bit
data source elements aligned to 64-bit but only with doubles as
destination type.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99660
Signed-off-by: Samuel Iglesias Gonsálvez <b753b212f30aed827c3eea2e437609dc37310153@igalia.com>
Tested-by: Mark Janes <dc19c7a5044e1b627d35321fa5e1121fad8638f9@intel.com>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler