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[Analysis] add isSplatValue() for vectors in IR

Description

[Analysis] add isSplatValue() for vectors in IR

We have the related getSplatValue() already in IR (see code just above the proposed addition).
But sometimes we only need to know that the value is a splat rather than capture the splatted
scalar value. Also, we have an isSplatValue() function already in SDAG.

Motivation - recent bugs that would potentially benefit from improved splat analysis in IR:
https://bugs.llvm.org/show_bug.cgi?id=37428
https://bugs.llvm.org/show_bug.cgi?id=42174

Differential Revision: https://reviews.llvm.org/D63138

Details

Committed
spatelJun 11 2019, 3:25 PM
Differential Revision
D63138: [Analysis] add isSplatValue() for vectors in IR
Parents
rL363105: [PowerPC][NFC]Remove sms-simple.ll test temporarily.
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