[llvm] [SPIRV] Audit `select` Result in SPIRVInstructionSelector (PR #115193)

[Sarah Spall via llvm-commits]

================
@@ -2194,9 +2220,9 @@ SPIRVInstructionSelector::buildI32Constant(uint32_t Val, MachineInstr &I,
                .addUse(GR.getSPIRVTypeID(SpvI32Ty))
                .addImm(APInt(32, Val).getZExtValue());
     }
-    constrainSelectedInstRegOperands(*MI, TII, TRI, RBI);
+    Result &= constrainSelectedInstRegOperands(*MI, TII, TRI, RBI);
----------------
spall wrote:

ditto

https://github.com/llvm/llvm-project/pull/115193