Rename analysis functions

[sunxd3]

The original names program!, for_loops!, and assignment! are confusing, so renamed them for better clarity.
Also some docstrings are removed: the code should be clear enough.
No actual changes.

[coveralls]

Pull Request Test Coverage Report for Build 8054133059

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• -2 of 28 (92.86%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.1%) to 80.293%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/compiler_pass.jl	15	17	88.24%

Totals
Change from base Build 8049063962:	0.1%
Covered Lines:	1479
Relevant Lines:	1842

---

💛 - Coveralls

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 80.29%. Comparing base (8471dcf) to head (4797f96).

❗ Current head 4797f96 differs from pull request most recent head a069b49. Consider uploading reports for the commit a069b49 to get more accurate results

Files	Patch %	Lines
src/compiler_pass.jl	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   80.15%   80.29%   +0.14%     
==========================================
  Files          21       21              
  Lines        1844     1842       -2     
==========================================
+ Hits         1478     1479       +1     
+ Misses        366      363       -3     

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