Add wasm64 to SwiftSetIfArchBitness.cmake

Author: MaxDesiatov

cmake/modules/SwiftSetIfArchBitness.cmake

@@ -30,7 +30,8 @@ function(set_if_arch_bitness var_name)
          "${SIA_ARCH}" STREQUAL "powerpc64" OR
          "${SIA_ARCH}" STREQUAL "powerpc64le" OR
          "${SIA_ARCH}" STREQUAL "s390x" OR
-         "${SIA_ARCH}" STREQUAL "riscv64")
+         "${SIA_ARCH}" STREQUAL "riscv64" OR
+         "${SIA_ARCH}" STREQUAL "wasm64")
     set("${var_name}" "${SIA_CASE_64_BIT}" PARENT_SCOPE)
   else()
     message(FATAL_ERROR "Unknown architecture: ${SIA_ARCH}")