Richard Smith 4e9e523fcf Assign APValues by swapping from a temporary. Removes a bunch of unnecessary ...

copy-construction, which Daniel Dunbar reports as giving a 0.75% speedup on
403.gcc/combine.c. The performance differences on my constexpr torture tests
are below the noise floor.

llvm-svn: 152455

2012-03-10 00:28:11 +00:00

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