[PA]: Allow custom gcc-10 path and more if-statement unit tests for gcc plugin

[rsulli55]

This PR is consists of two things:

1) Updating run_gcc_to_grfn.py, the gcc plugin Makefile, and test_gcc_plugin_c.py with the goals of

• making it possible to provide a custom gcc-10 path

• simplifying the creation of the json files required for writing unit tests (only one invocation of run_gcc_to_grfn.py is needed) These goals were achieved by adding additional command line arguments to run_gcc_to_grfn.py and extending the Makefile and test_gcc_plugin_c.py to check the environment for a CUSTOM_GCC_10_PATH variable.

  2) Updating the if_statement unit test, and writing the if_else_statement and if_elif_statement unit tests. There are some issues with the creating CAST/GrFN for these unit tests which I outline below so I have marked them skip for now.

  if_statement unit test

  I extended this unit test as we discussed so that the variable a is referenced in both if statements. After further discussion, I made it so that a is not only assigned, but accessed in the second if statement. However, the GrFN is not what we expected (there is no arrow from a at the top to the I block in the second if statement). The CAST looks fine though. Furthermore, the created GrFN cannot be executed. See Issue #277 if_statement--CAST.pdf if_statement--GrFN.pdf

if_else_statement unit test

This unit test also has problems with the created GrFN. The issues again appears to be the I blocks, and as above, the CAST looks fine. See Issue #276 if_else_statement--CAST.pdf if_else_statement--GrFN.pdf

if_elif_statement unit test

This unit test has problems with the CAST (which also causes the GrFN to be incorrect and execution results to be wrong). In the CAST you can see the else if statements are not attached to the else block like they should. I checked the gcc_ast.json, and that correctly attaches the else if off the else branch. It sounds like this issue is fixed on a branch Tito is working on if_elif_statement--CAST.pdf if_elif_statement--GrFN.pdf

[codecov[bot]]

Codecov Report

Merging #275 (77f6c22) into master (80c8a7c) will decrease coverage by 0.90%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #275      +/-   ##
==========================================
- Coverage   67.20%   66.29%   -0.91%     
==========================================
  Files          94       94              
  Lines       17821    17821              
==========================================
- Hits        11976    11814     -162     
- Misses       5845     6007     +162     

Impacted Files	Coverage Δ
...analysis/CAST2GrFN/visitors/cast_to_air_visitor.py	42.75% <0.00%> (-19.26%)	:arrow_down:
...mates/program_analysis/GCC2GrFN/gcc_ast_to_cast.py	56.04% <0.00%> (-7.46%)	:arrow_down:
...gram_analysis/CAST2GrFN/model/cast_to_air_model.py	77.68% <0.00%> (-4.81%)	:arrow_down:
...s/CAST2GrFN/visitors/cast_function_call_visitor.py	85.71% <0.00%> (-0.90%)	:arrow_down:
automates/model_analysis/graph_manipulation.py	70.19% <0.00%> (-0.56%)	:arrow_down:

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