Attempted to fix uninitialized variable warnings.
Attempted to fix uninitialized variable warnings.

Details:
- Added initialization statements to various macros used in level 1m and
  1m-like operations. I wasn't able to reproduce the reported behavior,
  so hopefully this takes care of it. Thanks to Jeff Hammond for the
  report.

xianyi/blis,arm-hpc/blis,arm-hpc/blis,scibuilder/blis,xianyi/blis,rwl/blis,rwl/blis,rwl/blis,arm-hpc/blis,scibuilder/blis,rwl/blis,scibuilder/blis,scibuilder/blis,xianyi/blis,xianyi/blis,arm-hpc/blis