Blocks of type "evaluate backward" are not correctly simulated

The testsuite does not currently have a block of this type (which typically appears when there is a purely forward variable).

Tasks:

• Fix the bug in MATLAB mode
• Fix the bug in bytecode
• Add a test in the testsuite

The test can simply consist of adding an equation to block_bytecode/ls2003.mod, which would read as: pure_forward = 0.9*pure_forward(+1) + e_pure_forward;. The e_pure_forward variable needs to be shocked, preferably in the end of the simulation sample.

added block decomposition bug labels

mentioned in commit preprocessor@3ca1914e

mentioned in commit cf523cb6

marked the checklist item Fix the bug in MATLAB mode as completed

mentioned in commit preprocessor@87aacc0f

mentioned in commit d4dbd78a

mentioned in commit 73253a06

closed with commit d61f4166

mentioned in commit 77e06207

mentioned in commit 16eb35d2

marked the checklist item Fix the bug in bytecode as completed

marked the checklist item Add a test in the testsuite as completed