Use C++11 raw string literal to embed intrinsics file. NFC

[sbc100]

Followup to #6206

See https://en.cppreference.com/w/cpp/language/string_literal

[sbc100]

Good idea! Unfortunately the windows bot here is erroring on a compiler limitation 😞

Looks like a limit they have removed but is present of VS 2022 and below: https://learn.microsoft.com/en-us/cpp/cpp/string-and-character-literals-cpp?view=msvc-170&redirectedfrom=MSDN#size-of-string-literals

Oh well. I guess we can wait