Fixes #2827.

Changes proposed in this pull request:
⯈ Bump Compiler#memoryOffset instead of allocating zero-filled segments.

There is an issue with the initialPages calculation in initDefaultMemory, however. The existing condition to run that calculation depends on memorySegments.length, which is now zero if only memory.data(n: i32) is called, as in the memory-config-errors test.
Making that calculation occur regardless of the number of memory segments would cause a separate issue: due to the default memory offsets of options.memoryBase, 1024, or 8, modules that previously compiled with an initial memory of 0 pages would compile with a minimum of 1 page.

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