[mlir] Avoid doublespace in error (NFC). (llvm#136560)

This was resulting in 2 spaces in the error message.

Author: jpienaar

mlir/lib/Interfaces/ControlFlowInterfaces.cpp

@@ -120,7 +120,7 @@ verifyTypesAlongAllEdges(Operation *op, RegionBranchPoint sourcePoint,
 
     TypeRange succInputsTypes = succ.getSuccessorInputs().getTypes();
     if (sourceTypes->size() != succInputsTypes.size()) {
-      InFlightDiagnostic diag = op->emitOpError(" region control flow edge ");
+      InFlightDiagnostic diag = op->emitOpError("region control flow edge ");
       return printRegionEdgeName(diag, sourcePoint, succ)
              << ": source has " << sourceTypes->size()
              << " operands, but target successor needs "
@@ -132,7 +132,7 @@ verifyTypesAlongAllEdges(Operation *op, RegionBranchPoint sourcePoint,
       Type sourceType = std::get<0>(typesIdx.value());
       Type inputType = std::get<1>(typesIdx.value());
       if (!regionInterface.areTypesCompatible(sourceType, inputType)) {
-        InFlightDiagnostic diag = op->emitOpError(" along control flow edge ");
+        InFlightDiagnostic diag = op->emitOpError("along control flow edge ");
         return printRegionEdgeName(diag, sourcePoint, succ)
                << ": source type #" << typesIdx.index() << " " << sourceType
                << " should match input type #" << typesIdx.index() << " "
@@ -202,7 +202,7 @@ LogicalResult detail::verifyTypesAlongControlFlowEdges(Operation *op) {
         // types match with the first one.
         if (!areTypesCompatible(regionReturnOperands->getTypes(),
                                 terminatorOperands.getTypes())) {
-          InFlightDiagnostic diag = op->emitOpError(" along control flow edge");
+          InFlightDiagnostic diag = op->emitOpError("along control flow edge");
           return printRegionEdgeName(diag, region, point)
                  << " operands mismatch between return-like terminators";
         }

mlir/test/Dialect/SCF/invalid.mlir

@@ -544,7 +544,7 @@ func.func @while_invalid_terminator() {
 
 func.func @while_cross_region_type_mismatch() {
   %true = arith.constant true
-  // expected-error@+1 {{'scf.while' op  region control flow edge from Region #0 to Region #1: source has 0 operands, but target successor needs 1}}
+  // expected-error@+1 {{'scf.while' op region control flow edge from Region #0 to Region #1: source has 0 operands, but target successor needs 1}}
   scf.while : () -> () {
     scf.condition(%true)
   } do {
@@ -557,7 +557,7 @@ func.func @while_cross_region_type_mismatch() {
 
 func.func @while_cross_region_type_mismatch() {
   %true = arith.constant true
-  // expected-error@+1 {{'scf.while' op  along control flow edge from Region #0 to Region #1: source type #0 'i1' should match input type #0 'i32'}}
+  // expected-error@+1 {{'scf.while' op along control flow edge from Region #0 to Region #1: source type #0 'i1' should match input type #0 'i32'}}
   %0 = scf.while : () -> (i1) {
     scf.condition(%true) %true : i1
   } do {
@@ -570,7 +570,7 @@ func.func @while_cross_region_type_mismatch() {
 
 func.func @while_result_type_mismatch() {
   %true = arith.constant true
-  // expected-error@+1 {{'scf.while' op  region control flow edge from Region #0 to parent results: source has 1 operands, but target successor needs 0}}
+  // expected-error@+1 {{'scf.while' op region control flow edge from Region #0 to parent results: source has 1 operands, but target successor needs 0}}
   scf.while : () -> () {
     scf.condition(%true) %true : i1
   } do {