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3fda50d391
As part of the RemoveDIs project we need LLVM to insert instructions using iterators wherever possible, so that the iterators can carry a bit of debug-info. This commit implements some of that by updating the contents of llvm/lib/Transforms/Utils to always use iterator-versions of instruction constructors. There are two general flavours of update: * Almost all call-sites just call getIterator on an instruction * Several make use of an existing iterator (scenarios where the code is actually significant for debug-info) The underlying logic is that any call to getFirstInsertionPt or similar APIs that identify the start of a block need to have that iterator passed directly to the insertion function, without being converted to a bare Instruction pointer along the way. I've also switched DemotePHIToStack to take an optional iterator: it needs to take an iterator, and having a no-insert-location behaviour appears to be important. The constructors for ICmpInst and FCmpInst have been updated too. They're the only instructions that take block _references_ rather than pointers for certain calls, and a future patch is going to make use of default-null block insertion locations. All of this should be NFC.