Time profiler: optimize json output time
Summary:
Use llvm::json::Array.reserve() to optimize json output time. Here is motivation:
https://reviews.llvm.org/D60609#
1468941. In short: for the json array
with ~32K entries, pushing back each entry takes ~4% of whole time compared
to the method of preliminary memory reservation: (3995-3845)/3995 = 3.75%.
Reviewers: lebedev.ri
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60792
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358522
91177308-0d34-0410-b5e6-
96231b3b80d8