Add ARB64EC mentions per Moyo (#3918)

Taojunshen · 3836425+corob-msft@users.noreply.github.com · PRMerger7 · web-flow · commit 2bf87bde233a · 2021-11-17T03:06:41.000+08:00
Co-authored-by: 3836425+corob-msft@users.noreply.github.com &lt;corob@microsoft.com&gt;
Co-authored-by: PRMerger7 &lt;prmrgr7@microsoft.com&gt;
diff --git a/docs/build/cmakesettings-reference.md b/docs/build/cmakesettings-reference.md
@@ -154,6 +154,8 @@ An *environment* encapsulates the environment variables set in the process that
 - `msvc_arm_x64`: Target ARM Windows with the 64-bit MSVC compiler.
 - `msvc_arm64`: Target ARM64 Windows with the MSVC compiler.
 - `msvc_arm64_x64`: Target ARM64 Windows with the 64-bit MSVC compiler.
+- `msvc_arm64ec`: Target ARM64EC Windows with the MSVC compiler.
+- `msvc_arm64ec_x64`: Target ARM64EC Windows with the 64-bit MSVC compiler.
 - `msvc_x64`: Target x64 Windows with the MSVC compiler.
 - `msvc_x64_x64`: Target x64 Windows with the 64-bit MSVC compiler.
 - `msvc_x86`: Target x86 Windows with the MSVC compiler.
