[clang-tidy] Invalid Fix-It generated for implicit-widening-multiplication-result (#76315)

The check currently emits warnings for the following code:
    `uint64_t fn() { return 1024 * 1024; }`

But the code generated after applying the notes will look like this:
    `uint64_t fn() { return static_cast<uint64_t>(1024 * )1024; }`

This is because when generating the notes the check will use the
beginLoc() and EndLoc() of the subexpr of the implicit cast.
But in some cases the AST Node might not have a beginLoc and EndLoc.
This seems to be true when the Node is composed of only 1 token (for
example an integer literal). Calling the getEndLoc() on this type of
node will simply return the known location which is, in this case, the
beginLoc.

Fixes #63070 #56728