py/asmxtensa: Extend existing specialised load/store operations range.

This commit updates the existing specialised implementations for
int-indexed 32-bit load and store operations, and adds a specialised
implementation for int-indexed 16-bit load.

The 32-bit operations relied on the fact that their applicability was
limited to a specific range, falling back on a generic implementation
otherwise.  Introducing a single entry point for each int-indexed
load/store operation size would break that assumption.  Now those two
operations contain fallback code to generate working code by themselves
instead of raising an exception.

The 16-bit operation instead simply did not have any range check, but it
was not exposed directly to the Viper emitter.  When a 16-bit
int-indexed load entry point was introduced, the existing implementation
would fail when accessing memory outside its 0..255 halfwords range.  A
specialised implementation is now present, performing fewer operations
than the existing Viper emitter equivalent.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

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