alloc-stress: format files

Format *.cpp according to the new .clang-format. The following command
was used to generate this change:

  $ find . \( -name \*.cpp -o -name \*.h \) -exec clang-format \
    --style=file -i {} \;

Test: mm
Bug: 171699326
Change-Id: I98b1cd32663fa4b8ffae3c5e74d2db0ec862e144
2 files changed