[decompiler] gkernel offline test

[water111]

I think we're going to need casts when popping expressions from the stack. This seems to be the biggest missing feature to getting the rest of the pointer math casts correct. Currently subexpression propagation drops casts.

[coveralls]

Pull Request Test Coverage Report for Build 651799220

• 163 of 187 (87.17%) changed or added relevant lines in 15 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 68.646%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
decompiler/Function/TypeAnalysis.cpp	1	2	50.0%
decompiler/IR2/FormExpressionAnalysis.cpp	57	58	98.28%
decompiler/util/TP_Type.h	6	8	75.0%
decompiler/util/data_decompile.cpp	1	3	33.33%
test/offline/offline_test_main.cpp	0	2	0.0%
decompiler/IR2/AtomicOpForm.cpp	29	33	87.88%
decompiler/IR2/Env.cpp	26	30	86.67%
decompiler/IR2/Form.cpp	13	17	76.47%
decompiler/analysis/expression_build.cpp	10	14	71.43%

Files with Coverage Reduction	New Missed Lines	%
decompiler/IR2/FormExpressionAnalysis.cpp	1	80.37%

Totals
Change from base Build 649885931:	0.07%
Covered Lines:	32132
Relevant Lines:	46808

---

💛 - Coveralls