Apply patch #3729: Printf for integers speed up
* doc/api/bench-libc.dox: Regenerate with GCC 4.7.1 (and new integer
to ASCII functions).
* include/stdlib.h: Define *toa() as inline functions.
* libc/misc/Files.am: Add new files.
* libc/misc/itoa.S: Rewrite.
* libc/misc/itoa_ncheck.S: New file.
* libc/misc/ltoa.S: Rewrite.
* libc/misc/ltoa_ncheck.S: New file.
* libc/misc/ultoa.S: Rewrite.
* libc/misc/ultoa_ncheck.S: New file.
* libc/misc/utoa.S: Rewrite.
* libc/misc/utoa_ncheck.S: New file.
* tests/simulate/stdlib/itoa-1.c: New file.
* tests/simulate/stdlib/itoa-2.c: New file.
* tests/simulate/stdlib/ltoa-1.c: New file.
* tests/simulate/stdlib/ltoa-2.c: New file.
* tests/simulate/stdlib/ultoa-1.c: New file.
* tests/simulate/stdlib/ultoa-2.c: New file.
* tests/simulate/stdlib/ultoa-3.c: New file.
* tests/simulate/stdlib/utoa-1.c: New file.
* tests/simulate/stdlib/utoa-2.c: New file.
* tests/simulate/stdlib/utoa-3.c: New file.
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