1912 1913 1915 performance optimizations 2

[stmcgovern]

Closes #1912.
Closes #1913.
Closes #1915.

Second PR of multiple for fine-grained performance enhancements.

[github-actions]

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[nlslatt]

@stmcgovern The PR tests are not making progress because you marked this ready for review after your last push. If you resign the last commit and force push, the tests will run.

[stmcgovern]

@nlslatt thank you

[codecov]

Codecov Report

Merging #1917 (86e52ad) into develop (397dc80) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1917      +/-   ##
===========================================
- Coverage    84.39%   84.37%   -0.02%     
===========================================
  Files          761      761              
  Lines        26866    26866              
===========================================
- Hits         22673    22669       -4     
- Misses        4193     4197       +4     

Impacted Files	Coverage Δ
src/vt/pool/static_sized/memory_pool_equal.h	100.00% <ø> (ø)
src/vt/messaging/envelope/envelope_ref.impl.h	100.00% <100.00%> (+14.28%)	⬆️
src/vt/pool/static_sized/memory_pool_equal.cc	100.00% <100.00%> (ø)
src/vt/runtime/runtime.cc	75.58% <100.00%> (-0.06%)	⬇️
src/vt/vrt/collection/manager.impl.h	95.49% <0.00%> (-0.99%)	⬇️
src/vt/phase/phase_manager.cc	92.56% <0.00%> (+1.35%)	⬆️

[PhilMiller]

Stand-alone PRs would be preferable, again for better traceability

[stmcgovern]

Split into PR #1927, #1928 and #1929.