Add inline and goto qualifier support to __asm__ declarations

[strimo378]

GCC's asm inline and asm goto qualifiers were silently rejected by CDT's parser. Additionally, the existing volatile qualifier was consumed but never stored, making it inaccessible via the AST API.

__asm__ inline ("nop");   // previously: parse error
__asm__ goto ("nop");     // previously: parse error
__asm__ volatile ("nop"); // previously: parsed but qualifier not queryable