[DNM] Address Sanitizer for Wasm/WASI #1897
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Previously, we used `Triple.platformName(conflatingDarwin: true)` to derive the OS directory under <ResourceDir>/lib/, which was documented as “the name clang uses”. However, this was in fact closer to what Swift itself uses for resource directories, and it diverged from Clang’s behavior in some cases. For example, for wasm32-unknown-wasip1-threads, Swift uses "wasi" as the OS name, but Clang uses "wasip1", matching the result of Triple::getOS, in their resource directory lookup. This patch aligns the behavior with Clang’s logic for looking up the compiler resource directory libraries.
We are adding support for sanitizers on WASI targets. This commit adds driver support by unblocking hard-coded checks and forwarding sanitizer flags to clang linker driver.
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This is just for building toolchain via xrepo CI