Fix switch statement issue

[kjw142857]

Fixes #93

[gemini-code-assist]

Code Review

This pull request refactors the switch statement code generation in src/compiler/code-generator.ts by reserving 4-byte placeholders for branch targets and patching them later with full 4-byte signed big-endian offsets. A critical issue was identified in the non-table switch (LOOKUPSWITCH) patching logic, where using caseLabels[k] to retrieve the target label can lead to index misalignment and incorrect branch targets or out-of-bounds errors. It is recommended to use caseLabelMap to look up the correct label for each case value instead.

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.27% (-0.23% 🔻)	7408/10251
🔴	Branches	59.12% (-0.06% 🔻)	2480/4195
🟡	Functions	69.04%	1320/1912
🟡	Lines	73.13% (-0.25% 🔻)	6974/9537

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟡	... / code-generator.ts	65.66% (-2.6% 🔻)	60.38% (-0.66% 🔻)	65.43%	66.47% (-2.64% 🔻)

Test suite run success

1134 tests passing in 64 suites.

Report generated by 🧪jest coverage report action from be416fd

[martin-henz]

Looks good!