[llvm] [GlobalISel] Diagnose inline assembly constraint lowering errors (PR #135782)

[Matt Arsenault via llvm-commits]

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@@ -212,6 +213,17 @@ static bool buildAnyextOrCopy(Register Dst, Register Src,
   return true;
 }
 
+static bool reportInlineAsmConstraintError(const CallBase &Call,
+                                           const GISelAsmOperandInfo &Info,
+                                           Twine Msg) {
+  LLVMContext &Ctx = Call.getContext();
+  Ctx.diagnose(DiagnosticInfoInlineAsm(
+      Call, "invalid constraint '" + Info.ConstraintCode + "': " + Msg));
+  // TODO(?): Allow selection to continue by recovering/leaving the gMIR in a
+  // good state, like the DAG does.
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arsenm wrote:

Yes, this needs to be done 

https://github.com/llvm/llvm-project/pull/135782