[Bug c/52554] Variable called $1 causes invalid asm to be generated

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52554

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> 2012-03-12 14:22:00 UTC ---
6.4.2.1 says that an identifier may contain "other implementation-defined
characters".