Support upper-case inline assembly

[ThomasHaas]

No description provided.

[ThomasHaas]

Hmm, my easy solution doesn't work. I hoped making everything lower case works, but the lexers have exactly one upper-case rule for Q. That's unfortunate.

[ThomasHaas]

Upper case letters are now recognized by the lexer but they will never match a rule.
However, inline assembly seems to be case insensitive and so, e.g., mfence and MFENCE should both be valid, but we only recognize the former.

[ThomasHaas]

see cna.h in #1016, where I had to comment out asm("PAUSE") because it was tripping up the parser.
With this PR, the code is parsed and asm("PAUSE") is treated as unknown inline assembly (replaced by NOOP + logger warning).

[hernanponcedeleon]

Let get this one merged first so you can keep the original code in #1016