Fix for type instability when using LKJChol

[torfjelde]

See TuringLang/Turing.jl#2102 for issue.

When adding tests for this I noticed that some of the DEMO_MODELS are not type-stable (even though they should be). This is probably relate to #530, but let's defer these to a different PR.

[yebai]

probably relate to #530, but let's defer these to a different PR.

@sunxd3 is working on a fix for #530

[github-actions]

Pull Request Test Coverage Report for Build 6616405812

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 82.767%

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Totals
Change from base Build 6577734451:	0.0%
Covered Lines:	2632
Relevant Lines:	3180

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💛 - Coveralls

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (efd9da3) 82.76% compared to head (53e07cd) 82.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #548   +/-   ##
=======================================
  Coverage   82.76%   82.76%           
=======================================
  Files          25       25           
  Lines        3180     3180           
=======================================
  Hits         2632     2632           
  Misses        548      548           

Files	Coverage Δ
src/utils.jl	81.49% <100.00%> (ø)

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[torfjelde]

Sorry; accidentally closed this.