[Toolchain] Add Swift & Bitcode related build settings to Swift toolchain

rdar://25472633

Author: shahmishal

utils/build-script-impl

@@ -2579,6 +2579,11 @@ if [[ "${INSTALLABLE_PACKAGE}" ]] ; then
       ${PLISTBUDDY_BIN} -c "Add ReportProblemURL string '${DARWIN_TOOLCHAIN_REPORT_URL}'" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
       ${PLISTBUDDY_BIN} -c "Add Aliases array" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
       ${PLISTBUDDY_BIN} -c "Add Aliases:0 string '${DARWIN_TOOLCHAIN_ALIAS}'" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
+      ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings dict" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
+      ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings:ENABLE_BITCODE bool NO" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
+      ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings:SWIFT_DISABLE_REQUIRED_ARCLITE bool YES" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
+      ${PLISTBUDDY_BIN} -c "Add OverrideBuildSettings:SWIFT_LINK_OBJC_RUNTIME bool YES" "${DARWIN_TOOLCHAIN_INFO_PLIST}"
+
       chmod a+r "${DARWIN_TOOLCHAIN_INFO_PLIST}"
 
       if [[ "${DARWIN_TOOLCHAIN_APPLICATION_CERT}" ]] ; then