mesa: Bump instruction execution limit to 65536
mesa: Bump instruction execution limit to 65536

Shader Model 3.0[1] requires that shaders be able to execute at least
65536 instructions.  Bump Mesa maxExec to that limit.  This allows
several vertex shaders in the OpenGL ES 2.0 conformance test suite to
run to completion.

1: http://en.wikipedia.org/wiki/High_Level_Shader_Language

Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

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