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c36e33ea7a
**Explanation**: Cherry-pick of #83792, merged as 450cb14597
WASILibc wasn't built for the embedded stdlib in `stdlib/public/Platform/CMakeLists.txt`. New `copy_wasilibc_modulemap_embedded_resource` and `embedded-stdlib-platform-${triple}` targets are added, the latter for `wasm32-unknown-wasip1` only for now. Also added a `wasilibc_functions.swift` test to verify the result.
**Scope**: limited to Embedded Swift for Wasm;
**Risk**: low due to limited scope;
**Testing**: added new lit test to the existing Embedded Swift test suite;
**Issue**: rdar://157467412
**Reviewer**: @bnbarham
This directory holds the Swift Standard Library's Darwin and Glibc Module, comprised of
- The overlay library, which amends some APIs imported from Clang module.
- Glibc only: The clang module map which specifies which headers need to be imported from Glibc for bare minimum functionality.
Note: On Darwin platforms, we assume clang module map is already installed in the system SDK.