[sanitizer] Calculate SizeClassAllocator32::ByteMap type from...

[sanitizer] Calculate SizeClassAllocator32::ByteMap type from Params::kSpaceSize and Params::kRegionSizeLog

Reviewers: eugenis

Subscribers: kubamracek, cryptoad, #sanitizers, llvm-commits

Tags: #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D61206

llvm-svn: 359374