[Bug c/46926] Paired sin() cos() calls optimized to sincos() call.

[jameskuyper at verizon dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46926

--- Comment #2 from James Kuyper Jr. <jameskuyper at verizon dot net> 
2010-12-13 18:41:55 UTC ---
info gcc says:

Functions which would normally be built in but do not have
     semantics defined by ISO C (such as `alloca' and `ffs') are not
     built-in functions with `-ansi' is used.