glsl: Add basic ARB_gpu_shader_int64 types

This adds the builtins and the lexer support.

To avoid too many warnings, it adds basic support to the type in a few
other places in mesa, mostly in the trivial places.

It also adds a query to be used later for if a type is an integer 32 or 64.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/compiler/glsl/ir_clone.cpp

@@ -337,6 +337,8 @@ ir_constant::clone(void *mem_ctx, struct hash_table *ht) const
    case GLSL_TYPE_FLOAT:
    case GLSL_TYPE_DOUBLE:
    case GLSL_TYPE_BOOL:
+   case GLSL_TYPE_UINT64:
+   case GLSL_TYPE_INT64:
       return new(mem_ctx) ir_constant(this->type, &this->value);
 
    case GLSL_TYPE_STRUCT: {