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Details:
- Removed code from gemmlike sandbox files bls_gemm_bp_var1.c and
bls_gemm_bp_var2.c that initializes the elements of the temporary
microtile to zero. This code, introduced recently in 7f7d726, did
not actually fix any bug (despite that commit's log entry). The
microtile does not need to be initialized because it is completely
overwritten by a "beta = 0" invocation of gemm prior to it being
read. Any NaNs or Infs present at the outset would have no impact
on the output matrix C. Thanks to Devin Matthews for reminding me
of this.