WasmParser: Specialize more hot paths

[kateinoigakukun]

With this change, we can achieve 17% speedup on stringify macro benchmark. The performance number is same as the case with CMO but with smaller binary size.

	baseline	CMO	this change
speed (ms)	198.1	172.8	169.9
size (kb) [^1]	1739	1923	1797

[^1]: swift-6.0.1-RELEASE, macOS 14.4.1 arm64

[kkebo]

Out of curiosity, what would happen if you combined this change with CMO?

[kateinoigakukun]

No speed up but it just adds code size

	baseline	CMO	this change	this change + CMO
speed (ms)	198.1	172.8	169.9	170.3
size (kb)	1739	1923	1797	1897

[kkebo]

Thanks!