arm EABI/EABIHF port of pascalscript.
Changes:
* Implement aligned passing of 64-bit parameters for EABI/EABIHF.
* Implement passing of floating point parameters in vfp registers for EABIHF
* Rewrite return value handling to avoid passing pointers to unsafe stack
space.
* Use constref on parameters to assembler to ensure passing by reference
Todo/issues:
* Only lightly tested, far more testing needed.
* Only EABIHF has been tested so far
* Handling of floating point return types needs implementing for old abi
FPA (the usual variant of old ABI).
* String return code looks dubious, may leak memory. Testing needed.
* Dynamic array return code was not reimplemented in the new return
value handling. The old code doesn't look like it ever worked.