version of clamped vector load from nick-sandbox
updated clamped vector load code to use IR node make methods
test code for clamped vector load, for posterity
removing test app
Merge branch 'master' into clamped-vector-load
removed print statements and added a few comments to clamped vector load
removed environment variable check
Merge branch 'master' into clamped-vector-load
Merge branch 'clamped-vector-load' into nick-sandbox

Conflicts:
	src/CodeGen_X86.cpp
changed tabs to spaces and replaced extractRamp with friendly IRMutator named FreeClampedRamp