[lld][WebAssembly] Add `--no-growable-memory` (#82890) We recently added `--initial-heap` - an option that allows one to up the initial memory size without the burden of having to know exactly how much is needed. However, in the process of implementing support for this in Emscripten (https://github.com/emscripten-core/emscripten/pull/21071), we have realized that `--initial-heap` cannot support the use-case of non-growable memories by itself, since with it we don't know what to set `--max-memory` to. We have thus agreed to move the above work forward by introducing another option to the linker (see https://github.com/emscripten-core/emscripten/pull/21071#discussion_r1491755616), one that would allow users to explicitly specify they want a non-growable memory. This change does this by introducing `--no-growable-memory`: an option that is mutally exclusive with `--max-memory` (for simplicity - we can also decide that it should override or be overridable by `--max-memory`. In Emscripten a similar mix of options results in `--no-growable-memory` taking precedence). The option specifies that the maximum memory size should be set to the initial memory size, effectively disallowing memory growth. Closes #81932.
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