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[WinEHPrepare] Provide a cloning mode which doesn't demote

Description

[WinEHPrepare] Provide a cloning mode which doesn't demote

We are experimenting with a new approach to saving and restoring SSA
values used across funclets: let the register allocator do the dirty
work for us.

However, this means that we need to be able to clone commoned blocks
without relying on demotion.

Details

Committed
majnemerSep 16 2015, 11:40 AM
Parents
rL247834: [WinEHPrepare] Refactor explicit EH preparation
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