Remove special cases for environment instruction generator

[s-kybound]

The CSE machine currently does not inject an environment instruction into the control when a function application or a block statement is the last item in a program. While this works for a single program, it breaks the REPL, where each submitted code snippet is treated as a singular program. The best way to deal with this issue is to force an environment instruction for any environment-producing statements at the end of the program to allow for newer REPL snippets to read from the correct environment.

Resolves #1576.

[coveralls]

Pull Request Test Coverage Report for Build 8211183573

Details

• 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 81.886%

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Totals
Change from base Build 8211108337:	0.0%
Covered Lines:	10374
Relevant Lines:	12242

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💛 - Coveralls