compiler: Save a single copy of the softfp64 shader in the context.

We were recompiling the softfp64 library of functions from GLSL to NIR
every time we compiled a shader that used fp64.  Worse, we were ralloc
stealing it to the GL context.  This meant that we'd accumulate lots of
copies for the lifetime of the context, which was a big space leak.

Instead, we can simply stash a single copy in the GL context, and use
it for subsequent compiles.  Having a single copy should be fine from
a memory context point of view: nir_inline_function_impl already clones
the necessary nir_function_impl's as it inlines.

KHR-GL45.enhanced_layouts.ssb_member_align_non_power_of_2 was previously
OOM'ing a system with 16GB of RAM when using softfp64.  Now it finishes
much more quickly and uses only ~200MB of RAM.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

src/mesa/main/context.c

@@ -1397,6 +1397,8 @@ _mesa_free_context_data(struct gl_context *ctx, bool destroy_compiler_types)
    if (destroy_compiler_types)
       _mesa_destroy_shader_compiler_types();
 
+   ralloc_free(ctx->SoftFP64);
+
    /* unbind the context if it's currently bound */
    if (ctx == _mesa_get_current_context()) {
       _mesa_make_current(NULL, NULL, NULL);