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[ADT] Simplify and optimize StringSwitch

Description

[ADT] Simplify and optimize StringSwitch

This change improves incremental rebuild performance on dual Xeon 8168
machines by 54%. This change also improves run time code gen by not
forcing the case values to be lvalues.

Details

Committed
davezarzyckiFeb 26 2018, 10:41 AM
Parents
rL326108: [Driver] Forward opt-remark hotness threshold to LTO
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