[PATCH] x86 avx: add isel pattern for (v2f64 (X86VBroadcast f64:$src))

[Akira Hatanaka]

The attached patch adds a pattern for X86Broadcast. This is the error
message I'm currently seeing when I compile the test case:


LLVM ERROR: Cannot select: 0x7fda11827200: v2f64 = X86ISD::VBROADCAST
0x7fda12024918 [ORD=2] [ID=14]

  0x7fda12024918: f64,ch = load 0x7fda1150bcd0, 0x7fda12024600,
0x7fda12025050<LD8[ConstantPool]> [ORD=2] [ID=12]

    0x7fda12024600: i64 = X86ISD::WrapperRIP 0x7fda12024c30 [ID=10]

      0x7fda12024c30: i64 = TargetConstantPool<double -1.000000e+00> 0
[ID=8]

    0x7fda12025050: i64 = undef [ID=2]

This fixes PR21050.
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