Functions defined inside a class declarations are inline by default.
Thus remove the 'inline' annotation from all such definitions.

Drive-by: Move the 'inline' annotation of
{WasmFunctionBuilder::signature} from the definition to the declaration.

R=jkummerow@chromium.org

Bug: v8:11384
Change-Id: I18be0b7d83c2414b3237e2f834e470c613143d7f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2953320Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75096}