avm2: Fix edge cases in Math.pow #30786

Job	Run time
Paths filter	7s
Coverage Report	10m 58s
Check dependencies	48s
Lints with Rust beta	6m 20s
Lints with Rust nightly	5m 57s
Test Rust stable / ubuntu-24.04	7m 15s
Test Rust stable / ubuntu-24.04-arm	4m 52s
Lints with Rust stable	5m 38s
Test Rust stable / macos-15	5m 36s
Test Rust stable / windows-2025	10m 24s
Test Rust beta / ubuntu-24.04	7m 11s
Test Rust nightly / ubuntu-24.04	5m 33s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Lints with Rust ${{ matrix.rust_version }}	0s
	1h 10m 39s

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