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Note: This was originally reverted to track down a buildbot error. Reapply without any modifications. Original commit message: In the large code model for X86 floating-point constants are placed in the constant pool and materialized by loading from it. Since the constant pool could be far away, a PC relative load might not work. Therefore we first materialize the address of the constant pool with a movabsq and then load from there the floating-point value. Fixes <rdar://problem/17674628>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216012 91177308-0d34-0410-b5e6-96231b3b80d8
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