Add LLVM Opaque Pointer Support

[idavis]

Once Opaque Pointers in QIR is resolved, the deprecated calls need to be replaced with the new versions:

Old Name	New Name
LLVMBuildLoad	LLVMBuildLoad2
LLVMBuildCall	LLVMBuildCall2
LLVMBuildInvoke	LLVMBuildInvoke2
LLVMBuildGEP	LLVMBuildGEP2
LLVMBuildInBoundsGEP	LLVMBuildInBoundsGEP2
LLVMBuildStructGEP	LLVMBuildStructGEP2
LLVMBuildPtrDiff	LLVMBuildPtrDiff2
LLVMConstGEP	LLVMConstGEP2
LLVMConstInBoundsGEP	LLVMConstInBoundsGEP2
LLVMAddAlias	LLVMAddAlias2

In preparation for this, we need to move PyQIR to LLVM 16 which should allow working with modules that can use both typed and opaque pointers. This should give us a working base from which others can migrate their tooling to support opaque pointers. We will need to design an API that allows us to turn on/off opaque pointers and use the appropriate LLVM calls depending on which API is being used.