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Author SHA1 Message Date
David Majnemer 57b94c8d6a [ConstantFolding] Use ConstantExpr::getWithOperands 
ConstantExpr::getWithOperands does much of the hard work that
ConstantFoldInstOperandsImpl tries to do but more completely.

This lets us fold ExtractValue/InsertValue expressions.

llvm-svn: 277100
 2016-07-29 03:27:31 +00:00
David Majnemer 19d024b2fd [ConstantFolding] Don't bail on folding if ConstantFoldConstantExpression fails 
When folding an expression, we run ConstantFoldConstantExpression on
each operand of that expression.
However, ConstantFoldConstantExpression can fail and retur nullptr.

Previously, we would bail on further refining the expression.
Instead, use the original operand and see if we can refine a later
operand.

llvm-svn: 276959
 2016-07-28 06:39:48 +00:00
David Majnemer bc36b15253 [ConstantFolding] Correctly handle failures in ConstantFoldConstantExpressionImpl 
Failures in ConstantFoldConstantExpressionImpl were ignored causing
crashes down the line.

This fixes PR28725.

llvm-svn: 276827
 2016-07-27 02:39:16 +00:00