arb_gpu_shader5: Add a fragment shader bitCount execution test.
arb_gpu_shader5: Add a fragment shader findLSB execution test.
arb_gpu_shader5: Add a fragment shader findMSB execution test.

v2: Subtract return value from 31 to get the count in LSB terms.
arb_gpu_shader5: Add a fragment shader bitfieldReverse execution test.
arb_gpu_shader5: Add a fragment shader bitfieldExtract execution test.
arb_gpu_shader5: Add a fragment shader bitfieldInsert execution test.
arb_gpu_shader5: Add a vertex shader bitCount execution test.
arb_gpu_shader5: Add a vertex shader bitfieldReverse execution test.
arb_gpu_shader5: Add a vertex shader findMSB execution test.

v2: Subtract return value from 31 to get the count in LSB terms.
arb_gpu_shader5: Add a vertex shader findLSB execution test.
arb_gpu_shader5: Add a vertex shader bitfieldExtract execution test.
arb_gpu_shader5: Add a vertex shader bitfieldInsert execution test.
arb_gpu_shader5: Add a constant eval bitCount execution test.

v2: Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add a constant eval findLSB execution test.

v2: Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add a constant eval findMSB execution test.

v2: Subtract return value from 31 to get the count in LSB terms.
    Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add a constant eval bitfieldReverse execution test.

v2: Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add a constant eval bitfieldExtract execution test.

v2: Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add a constant eval bitfieldInsert execution test.

v2: Call nonexistent bad_constant_folding() function if test fails.
arb_gpu_shader5: Add shader_tests to all.tests.
depthstencil-render-miplevels: Move the rendering to display() time.

I want to actually present results on the screen so that debugging
this test involves less meditation before achieving enlightenment.

Reviewed-by: Paul Berry <stereotype441@gmail.com>