[Wasm] Build compiler with assertions

I added an assertion to catch new relative function pointers in
swiftlang#42094, so we should enable
assertions to utilize it while building stdlib and corelibs

Author: kateinoigakukun

utils/webassembly/build-presets.ini

@@ -13,7 +13,6 @@ enable-experimental-differentiable-programming=1
 [preset: webassembly-install]
 
 release
-no-assertions
 install-swift
 install-destdir=%(INSTALL_DESTDIR)s
 swift-install-components=autolink-driver;compiler;clang-resource-dir-symlink;stdlib;sdk-overlay;parser-lib;editor-integration;tools;testsuite-tools;toolchain-tools;license;sourcekit-inproc;swift-remote-mirror;swift-remote-mirror-headers

utils/webassembly/build-toolchain.sh

@@ -62,7 +62,7 @@ DIST_TOOLCHAIN_SDK=$DIST_TOOLCHAIN_DESTDIR/$TOOLCHAIN_NAME
 
 HOST_BUILD_ROOT=$SOURCE_PATH/host-build
 TARGET_BUILD_ROOT=$SOURCE_PATH/target-build
-HOST_BUILD_DIR=$HOST_BUILD_ROOT/Ninja-Release
+HOST_BUILD_DIR=$HOST_BUILD_ROOT/Ninja-ReleaseAssert
 
 build_host_toolchain() {
   # Build the host toolchain and SDK first.