[llvm] [GISel] Add LookThroughInstrs for getIConstantVRegVal and getIConstan… (PR #68327)

[Michael Maitland via llvm-commits]

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@@ -301,7 +302,8 @@ std::optional<APInt> llvm::getIConstantVRegVal(Register VReg,
 }
 
 std::optional<int64_t>
-llvm::getIConstantVRegSExtVal(Register VReg, const MachineRegisterInfo &MRI) {
+llvm::getIConstantVRegSExtVal(Register VReg, const MachineRegisterInfo &MRI,
+                              bool LookThroughInstrs = false) {
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michaelmaitland wrote:

Yes, thats important!

https://github.com/llvm/llvm-project/pull/68327