fix sc when the block after the delay slot is optimized out

[water111]

;; if the original code is (set! s5 (or v1 s5))

    bnel s7, v1, L41
    or s5, v1, r0

    or s5, s5, r0 ;; <- eliminated, which confused the decompiler as there is no block here
L41:

[coveralls]

Pull Request Test Coverage Report for Build 1065326057

• 20 of 21 (95.24%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.01%) to 68.551%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
decompiler/IR2/FormExpressionAnalysis.cpp	3	4	75.0%

Totals
Change from base Build 1065323155:	0.01%
Covered Lines:	38939
Relevant Lines:	56803

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💛 - Coveralls