1.26 regression: hovering over a long double shows an invalid value on Linux

[sean-mcmanus]

Use code like const long double ldvar = 10.0l; and hover over the long double const variable or literal and it shows an invalid value. It works with 1.25.3. Reproed on Linux x64 (doesn't repro on Mac or Windows).

Also, repros with 10.0W (__float80), but not 10.0Q (__float128).

[sean-mcmanus]

This is caused by the fix for #12431 , so reverting that fixes this.

[sean-mcmanus]

I filed internal bug 2497788 on our parser.