[PATCH] D11340: [X86] Allow load folding into PUSH instructions

[Michael Kuperstein]

mkuper created this revision.
mkuper added reviewers: spatel, RKSimon.
mkuper added a subscriber: llvm-commits.

Adds PUSHes to the folding tables.
This also required a fix to the TD definition, since the memory forms of the PUSH/POP instructions did not have the right mayLoad/mayStore flags.

http://reviews.llvm.org/D11340

Files:
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.td
  test/CodeGen/X86/fold-push.ll

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