[TensorExpr] Methods name cleanup in LoopNest class.

[ZolotukhinM]

Stack from ghstack:

• [TensorExpr] Cleanup implementation of alloc/free insertion. #35176 [TensorExpr] Cleanup implementation of alloc/free insertion.
• [TensorExpr] Factor out LoopNest::insertAllocFree. #35175 [TensorExpr] Factor out LoopNest::insertAllocFree.
• [TensorExpr] Methods name cleanup in LoopNest class. #35174 [TensorExpr] Methods name cleanup in LoopNest class.
• [TensorExpr] Replace ExprHandle with const Expr* in Substitute. #35173 [TensorExpr] Replace ExprHandle with const Expr* in Substitute.

Differential Revision: D20585575

[dr-ci]

💊 CircleCI build failures summary and remediations

As of commit 5fc9106 (more details on the Dr. CI page):

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[facebook-github-bot]

@ZolotukhinM merged this pull request in ceb4ed3.