PowerPC: Optimized samequantum implementation
PowerPC: Fix samequantum software implementation

And also adds generic samequantum test.
libdfp: Add hidden definitions to FP classify functions

This patch adds hidden def for fpclassify, isfinite, isinf, and isnan.
It also cleans up the PowerPC implementation of the functions.
PowerPC: Remove ununsed files

This patch removed the is_template.h, which is no longer needed after
code refactoring; and finited32.c and finited64.c, since isfinite
implementation now provides strong_alias for the required symbols.
libdfp: Fix PLT calls for FP classify functions.

This patch adjust calls to isnan, isinf, isfinite, and fpclassify to
make then local instead of using a PLT.