mesa/st/glsl_to_tgsi: Expose array live range tracking and merging

This patch ties in the array split, merge, and interleave code.

shader-db changes in the TGSI code are:

              original code  |  array-merge  |       change
              mean      max  |  mean    max  | best  mean %  worst
      -----------------------------------------------------------
      arrays   0.05       2  |   0.00     0  |  -2   -100      0
total temps    5.05      21  |   4.92    20  | -15   -2.59     1
      instr   55.33     988  |  55.20   988  | -15   -0.24     0

Evaluation:

Run shader-db in single thread mode (otherwise the output is
not ordered and the best and worst column don't make sense) to
get results pre-stats.txt and post-stats.txt. Then using
python pandas:

 import pandas as pd
 old_stats = pd.read_csv('pre-stats.txt')
 new_stats = pd.read_csv('post-stats.txt')
 omean = old_stats.mean()
 omax = old_stats.max()
 nmean = new_stats.mean()
 nmax = new_stats.max()
 delta =  new_stats - old_stats
 pd.concat([omean, omax, nmean, nmax, delta.min(),
            delta.mean()/old_stats.mean()*100, delta.max()],
            axis=1, keys=['mean', 'max', 'mean', 'max', 'best',
            'avg change %', 'worst'])

v4: - Correct typo and add bugs that are fixed by this series.
    - Update stats and describe stats evaluation

Bugzilla:
  https://bugs.freedesktop.org/show_bug.cgi?id=105371
  https://bugs.freedesktop.org/show_bug.cgi?id=100200
Signed-off-by: Gert Wollny <[email protected]>
Acked-by: Dave Airlie <[email protected]>

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