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glsl: Don't allow invalid identifier names in struct/interface fields.
Note: we need to make an exception for the gl_PerVertex interface
block, since built-in variables are allowed to be redeclared inside
it. Future patches will make redeclaration of gl_PerVertex work
properly.
Fixes piglit tests:
- spec/glsl-1.50/compiler/interface-block-array-elem-uses-gl-prefix.vert
- spec/glsl-1.50/compiler/named-interface-block-elem-uses-gl-prefix.vert
- spec/glsl-1.50/compiler/unnamed-interface-block-elem-uses-gl-prefix.vert
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>