[SPECCPU2017] Check for 'all' input data directory before generating command

Summary: As of SPEC CPU2017 1.0.5, 526.blender_r/data does not contain an 'all' subdirectory, which breaks the build.

Reviewers: Meinersbur, MatzeB

Subscribers: mgorny, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68967

llvm-svn: 375480
1 file changed