Include workarounds with bug references for a pair of simple HLJS bugs
related to parsing character literals.
* In Go, HLJS misunderstands backslash character literals.
* In C++, HLJS misunderstands wchar_t character literals.
Bug: Issue 5007
Bug: Issue 5242
Change-Id: I4c92b254062198dbf043ccd401e3224961a84a33