[cfe-dev] Checkers time statistic

[Plotnikov Dmitry via cfe-dev]

Hello,

Sometimes Clang analyzer works slowly, so I implemented timers that 
measure actual work time for each checker. This patch is using 
llvm::Timer class for time tracking, and provides more detailed report 
for -analyzer-stats option:

===-------------------------------------------------------------------------===
                          Miscellaneous Ungrouped Timers
===-------------------------------------------------------------------------===

    ---User Time---   --System Time--   --User+System--   ---Wall 
Time---  --- Name ---
    0.2760 (  6.7%)   0.0760 (  9.5%)   0.3520 (  7.1%)   0.3398 ( 
6.9%)  core.NullDereference
    0.1560 (  3.8%)   0.0440 (  5.5%)   0.2000 (  4.1%)   0.2346 ( 
4.8%)  unix.Malloc
    0.0680 (  1.6%)   0.0160 (  2.0%)   0.0840 (  1.7%)   0.0652 ( 
1.3%)  core.DynamicTypePropagation
    0.0760 (  1.8%)   0.0000 (  0.0%)   0.0760 (  1.5%)   0.0573 ( 
1.2%)  core.CallAndMessage
...


Probably there is more convenient way to determine which checker is 
working slowly?

---
Best Regards,
Dmitry Plotnikov,
Researcher at ISP RAS.
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