t/perf: add Scalar performance tests
Create 'p9210-scalar.sh' for testing Scalar performance and comparing performance of Git operations in Scalar registrations and standard repositories. Example results: Test this tree ------------------------------------------------------------------------ 9210.2: scalar clone 14.82(18.00+3.63) 9210.3: git clone 26.15(36.67+6.90) 9210.4: git status (scalar) 0.04(0.01+0.01) 9210.5: git status (non-scalar) 0.10(0.02+0.11) 9210.6: test_commit --append --no-tag A (scalar) 0.08(0.02+0.03) 9210.7: test_commit --append --no-tag A (non-scalar) 0.13(0.03+0.11) Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Victoria Dye <vdye@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>