Pass -hwasan-allow-ifunc when building with hwasan.

	asanLdflags = []string{"-Wl,-u,__asan_preinit"}

	asanLibs    = []string{"libasan"}

	hwasanCflags = []string{"-fno-omit-frame-pointer", "-Wno-frame-larger-than=", "-mllvm", "-hwasan-create-frame-descriptions=0"}

	// TODO(pcc): Stop passing -hwasan-allow-ifunc here once it has been made

	// the default.

	hwasanCflags = []string{"-fno-omit-frame-pointer", "-Wno-frame-larger-than=",

		"-mllvm", "-hwasan-create-frame-descriptions=0",

		"-mllvm", "-hwasan-allow-ifunc"}

	cfiCflags = []string{"-flto", "-fsanitize-cfi-cross-dso",

		"-fsanitize-blacklist=external/compiler-rt/lib/cfi/cfi_blacklist.txt"}