Option to pass alignment hints to the load and store macros

[Heath123]

Closes #65

This won't work with the original w2c2_base.h, but a custom one should be able to make use of it.

Questions:

• Should I validate whether the hints have valid values, or just assume it's valid like I am now?
• Should I be doing result->align = 1 << align; in the instruction reader like I have here, leave it as-is in the instruction struct and do that as the C source file is written, or write it to the file as-is and have the macros do it?

[Heath123]

Oops, looks like I made a mistake that got caught by the test cases again

[turbolent]

Nice, thank you for adding support for this!

Maybe the default header file can include alignment aware variants of the load/store functions (e.g. i32_store -> i32_store_a/i32_store_aligned) and wasmCWriteLoadExpr/wasmCWriteStoreExpr could generate calls to those functions if the flag is set?

[turbolent]

Sorry, I missed your questions:

Should I validate whether the hints have valid values, or just assume it's valid like I am now?

No, you don't need validate it. w2c2 does not do any validation and assumes the input module is valid, as other tools are already available to validate modules. That keeps w2c2 simple.

Should I be doing result->align = 1 << align; in the instruction reader like I have here, leave it as-is in the instruction struct and do that as the C source file is written, or write it to the file as-is and have the macros do it?

The way it is implemented at the moment seems fine to me 👍