Fix timing with TBB and a minor GCC bug

[ProfFan]

#92

and GCC 15 bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118634

On my AMD 9950X3D:

numberOfProblems = 1000000
problemSize = 4
With 1 threads:
Without memory allocation, grain size = 1, time = 0.206183
Without memory allocation, grain size = 10, time = 0.170344
Without memory allocation, grain size = 100, time = 0.156581
Without memory allocation, grain size = 1000, time = 0.15655
With memory allocation, grain size = 1, time = 0.199588
With memory allocation, grain size = 10, time = 0.199542
With memory allocation, grain size = 100, time = 0.199536
With memory allocation, grain size = 1000, time = 0.199497

With 4 threads:
Without memory allocation, grain size = 1, time = 0.0410819
Without memory allocation, grain size = 10, time = 0.0399602
Without memory allocation, grain size = 100, time = 0.0404226
Without memory allocation, grain size = 1000, time = 0.0400035
With memory allocation, grain size = 1, time = 0.051057
With memory allocation, grain size = 10, time = 0.051184
With memory allocation, grain size = 100, time = 0.0512407
With memory allocation, grain size = 1000, time = 0.0512729

With 8 threads:
Without memory allocation, grain size = 1, time = 0.0251816
Without memory allocation, grain size = 10, time = 0.0230612
Without memory allocation, grain size = 100, time = 0.0242118
Without memory allocation, grain size = 1000, time = 0.0247101
With memory allocation, grain size = 1, time = 0.0273827
With memory allocation, grain size = 10, time = 0.0301596
With memory allocation, grain size = 100, time = 0.0287985
With memory allocation, grain size = 1000, time = 0.0293065

Summary of results:
4 threads, without allocation, grain size = 1, speedup = 5.01883
4 threads, without allocation, grain size = 10, speedup = 4.26285
4 threads, without allocation, grain size = 100, speedup = 3.87361
4 threads, without allocation, grain size = 1000, speedup = 3.91341
4 threads, with allocation, grain size = 1, speedup = 3.90913
4 threads, with allocation, grain size = 10, speedup = 3.89853
4 threads, with allocation, grain size = 100, speedup = 3.8941
4 threads, with allocation, grain size = 1000, speedup = 3.89088
8 threads, without allocation, grain size = 1, speedup = 8.18785
8 threads, without allocation, grain size = 10, speedup = 7.38661
8 threads, without allocation, grain size = 100, speedup = 6.46715
8 threads, without allocation, grain size = 1000, speedup = 6.33548
8 threads, with allocation, grain size = 1, speedup = 7.28884
8 threads, with allocation, grain size = 10, speedup = 6.61622
8 threads, with allocation, grain size = 100, speedup = 6.9287
8 threads, with allocation, grain size = 1000, speedup = 6.80726

[dellaert]

Awesome!