[llvm] [X86][GISel] Add DU chain lookups for LOAD & STORE (PR #87453)

[Malay Sanghi via llvm-commits]

================
@@ -68,6 +71,143 @@ X86RegisterBankInfo::getRegBankFromRegClass(const TargetRegisterClass &RC,
   llvm_unreachable("Unsupported register kind yet.");
 }
 
+// Returns whether opcode \p Opc is a pre-isel generic floating-point opcode,
+// having only floating-point operands.
+static bool isPreISelGenericFloatingPointOpcode(unsigned Opc) {
----------------
MalaySanghi wrote:

Apologies it me some time to get back to this. Updated.

https://github.com/llvm/llvm-project/pull/87453