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[builtins] emutls cleanup: determine header size using sizeof

Description

[builtins] emutls cleanup: determine header size using sizeof

Summary: Also add a few post-#else/#endif comments

Reviewers: echristo, srhines

Reviewed By: echristo

Subscribers: chh, delcypher, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D47861