o1vm/riscv32: implement mul_hi_signed_unsigned to be used for Mulhsu

[dannywillems]

No description provided.

[svv232]

Suggested change

	let x: u32 = (*x).try_into().unwrap();
	let y: u32 = (*y).try_into().unwrap();
	let res = (((x as i32) as i64) * (y as i64)) as u64;
	let res = (res >> 32) as u32;
	let res = res as u64;
	let x: i32 = (*x).try_into().unwrap();
	let y: i32 = (*y).try_into().unwrap();
	let res = ((x as i64) * (y as i64)) as u64;
	let res = (res >> 32) as u32;
	let res = res as u64;

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 22 lines in your changes missing coverage. Please review.

Project coverage is 71.88%. Comparing base (ade00c9) to head (eb01801).

Files with missing lines	Patch %	Lines
o1vm/src/interpreters/riscv32im/witness.rs	0.00%	14 Missing ⚠️
o1vm/src/interpreters/riscv32im/constraints.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@                       Coverage Diff                       @@
##           dw/riscv32-impl-m-type-remu    #2809      +/-   ##
===============================================================
- Coverage                        71.91%   71.88%   -0.03%     
===============================================================
  Files                              255      255              
  Lines                            60041    60063      +22     
===============================================================
- Hits                             43177    43175       -2     
- Misses                           16864    16888      +24     

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