Add no type error (rust-lang#672)

Author: wsmoses

enzyme/Enzyme/AdjointGenerator.h

@@ -2814,6 +2814,13 @@ class AdjointGenerator
         vd = TypeTree(BaseType::Pointer).Only(0);
         goto known;
       }
+      if (CustomErrorHandler) {
+        std::string str;
+        raw_string_ostream ss(str);
+        ss << "Cannot deduce type of copy " << MTI;
+        CustomErrorHandler(str.c_str(), wrap(&MTI), ErrorType::NoType,
+                           &TR.analyzer);
+      }
       EmitFailure("CannotDeduceType", MTI.getDebugLoc(), &MTI,
                   "failed to deduce type of copy ", MTI);
 

enzyme/Enzyme/Utils.h

@@ -69,7 +69,8 @@ class ScalarEvolution;
 enum class ErrorType {
   NoDerivative = 0,
   NoShadow = 1,
-  IllegalTypeAnalysis = 2
+  IllegalTypeAnalysis = 2,
+  NoType = 3
 };
 
 extern "C" {

enzyme/test/Enzyme/ForwardMode/fmuladd.ll

@@ -20,9 +20,9 @@ declare double @__enzyme_fwddiff(double (double, double, double)*, ...)
 
 ; CHECK: define internal double @fwddiffetester(double %x, double %"x'", double %y, double %"y'", double %z, double %"z'")
 ; CHECK-NEXT: entry:
-; CHECK-NEXT:   %0 = fmul fast double %y, %"x'"
-; CHECK-NEXT:   %1 = fmul fast double %x, %"y'"
-; CHECK-NEXT:   %2 = fadd fast double %1, %0
+; CHECK-DAG:   %[[i0:.+]] = fmul fast double %y, %"x'"
+; CHECK-DAG:   %[[i1:.+]] = fmul fast double %x, %"y'"
+; CHECK-NEXT:   %2 = fadd fast double %[[i1]], %[[i0]]
 ; CHECK-NEXT:   %3 = fadd fast double %2, %"x'"
 ; CHECK-NEXT:   ret double %3
 ; CHECK-NEXT: }