glsl: Properly handle blocks that define the same field name.

Currently we can have name space collisions between blocks that define the same
fields. For example:

in block
{
    vec4 Color;
} In[];

out block
{
    vec4 Color;
} Out;

These two blocks will assign the same interface name (block.Color) to the Color
field in flatten_named_interface_blocks_declarations.cpp, leading to havoc.
This was breaking badly the gl-320-primitive-shading test from ogl-samples.

The patch uses the block instance name to avoid collisions, producing names
like block.In.Color and block.Out.Color to avoid the name clash.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=76394
Reviewed-by: Kenneth Graunke <[email protected]>

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