Implement math intrinsics for WGSL (shader-slang#5078)

* Implement math intrinsics for WGSL This commit implements math related intrinsics and a few others for WGSL. The implementation is based on the following doc, https://www.w3.org/TR/WGSL slang-test was looking for the downstream compiler for WGSL even though it is not used. This commit adds a minimal change to avoid the crash.
jkwak-work · Sep 17, 2024 · 0716646 · 0716646
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diff --git a/include/slang.h b/include/slang.h
@@ -637,6 +637,7 @@ extern "C"
         SLANG_PASS_THROUGH_LLVM,                    ///< LLVM 'compiler' - includes LLVM and Clang
         SLANG_PASS_THROUGH_SPIRV_OPT,               ///< SPIRV-opt
         SLANG_PASS_THROUGH_METAL,                   ///< Metal compiler
+        SLANG_PASS_THROUGH_WGSL,                    ///< WGSL compiler
         SLANG_PASS_THROUGH_COUNT_OF,
     };