WIP adjoint

[vpuri3]

should close https://github.com/SciML/LinearSolve.jl/issues/92

[coveralls]

Pull Request Test Coverage Report for Build 2192146140

• 3 of 4 (75.0%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-1.2%) to 57.877%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/common.jl	1	2	50.0%
<!--	Total:	3	4

Files with Coverage Reduction	New Missed Lines	%
src/factorization.jl	1	73.64%
<!--	Total:	1

Totals
Change from base Build 2184492217:	-1.2%
Covered Lines:	338
Relevant Lines:	584

---

💛 - Coveralls

[codecov[bot]]

Codecov Report

Merging #126 (f43c264) into main (1bb2a3a) will increase coverage by 0.03%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
+ Coverage   59.20%   59.24%   +0.03%     
==========================================
  Files          11       11              
  Lines         603      606       +3     
==========================================
+ Hits          357      359       +2     
- Misses        246      247       +1     

Impacted Files	Coverage Δ
src/common.jl	72.91% <50.00%> (-1.00%)	:arrow_down:
src/factorization.jl	75.52% <100.00%> (+0.17%)	:arrow_up:

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