Sanjay Patel 904cd39b05 [x86] Allow merging multiple instances of an immediate within a basic block for code size savings, for 64-bit constants.
This patch handles 64-bit constants which can be encoded as 32-bit immediates.

It extends the functionality added by https://reviews.llvm.org/D11363 for 32-bit constants to 64-bit constants.

Patch by Sunita Marathe!

Differential Revision: https://reviews.llvm.org/D23391

llvm-svn: 278857
2016-08-16 21:35:16 +00:00
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