vchoi_fork

[svn-r8548] Purpose:
Improvement.

Description:
Some compilers, e.g., Intel C v7.0, took a long time to compile
with optimization when a module routine contains many code lines.
Divide up all those types detections macros into subroutines, both
to avoid the compiler optimization error and cleaner codes.

Platforms tested:
h5committested.

Misc. update: