Make cmp+branch execution handlers use 2 branch sites

[Robbepop]

This dramatically improves branch prediction.
Benchmarks show that performance improves significantly across the board on the tested Apple M2 Pro.

Codegen (Before)

wasmi::engine::executor::handler::exec::branch_i32_lt_ri:
Lfunc_begin1321:
        .cfi_startproc
        ldr x8, [x1, #8]
        ldr w9, [x1, #16]
        add x10, x1, #24
        cmp w9, w6
        csel x1, x8, x10, gt
        ldr x7, [x1]
        br x7

Codegen (After)

wasmi::engine::executor::handler::exec::branch_i32_lt_ri:
Lfunc_begin1321:
        .cfi_startproc
        ldr w8, [x1, #16]
        cmp w8, w6
        b.le LBB1321_2
        ldr x1, [x1, #8]
        ldr x7, [x1]
        br x7
LBB1321_2:
        ldr x7, [x1, #24]!
        br x7

Benchmarks

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.28%. Comparing base (c242c15) to head (bd67def).

Files with missing lines	Patch %	Lines
crates/wasmi/src/engine/executor/handler/exec.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2027      +/-   ##
==========================================
- Coverage   76.29%   76.28%   -0.01%     
==========================================
  Files         168      168              
  Lines       15531    15532       +1     
==========================================
  Hits        11849    11849              
- Misses       3682     3683       +1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.