[ASTDumper][OpenMP] CapturedDecl has a 'nothrow' bit

[lebedev.ri]

Summary

Was trying to understand how complicated it would be to write
a clang-tidy openmp-exception-escape-ish check once D57100 lands.

Just so it happens, all the data is already there,
it is just conveniently omitted from AST dump.

[ABataev]

LG

[lebedev.ri]

In D57452#1377140, @ABataev wrote:

LG

Thank you for the review.

cfe/trunk/lib/AST/ASTDumper.cpp

 }
 
 void ASTDumper::VisitPragmaDetectMismatchDecl(
     const PragmaDetectMismatchDecl *D) {
   OS << " \"" << D->getName() << "\" \"" << D->getValue() << "\"";
 }
 
 void ASTDumper::VisitCapturedDecl(const CapturedDecl *D) {
+  if (D->isNothrow())
+    OS << " nothrow";
   dumpStmt(D->getBody());
 }
 
 //===----------------------------------------------------------------------===//
 // OpenMP Declarations
 //===----------------------------------------------------------------------===//
 
 void ASTDumper::VisitOMPThreadPrivateDecl(const OMPThreadPrivateDecl *D) {

cfe/trunk/test/AST/dump.cpp

 // CHECK-NEXT: |       | `-DeclRefExpr {{.+}} <col:48> 'int' lvalue OMPCapturedExpr {{.+}} 'a' 'int &'
 // CHECK-NEXT: |       |-OMPSharedClause {{.+}} <col:51, col:59>
 // CHECK-NEXT: |       | `-MemberExpr {{.+}} <col:58> 'int' lvalue ->b
 // CHECK-NEXT: |       |   `-CXXThisExpr {{.+}} <col:58> 'S *' this
 // CHECK-NEXT: |       |-OMPScheduleClause {{.+}} <col:61, col:79>
 // CHECK-NEXT: |       | `-ImplicitCastExpr {{.+}} <col:78> 'int' <LValueToRValue>
 // CHECK-NEXT: |       |   `-DeclRefExpr {{.+}} <col:78> 'int' lvalue OMPCapturedExpr {{.+}} '.capture_expr.' 'int'
 // CHECK-NEXT: |       `-CapturedStmt {{.+}} <line:[[@LINE-15]]:5, line:[[@LINE-14]]:9>
-// CHECK-NEXT: |         |-CapturedDecl {{.+}} <<invalid sloc>> <invalid sloc>
+// CHECK-NEXT: |         |-CapturedDecl {{.+}} <<invalid sloc>> <invalid sloc> nothrow
 // CHECK-NEXT: |         | |-ForStmt {{.+}} <line:[[@LINE-17]]:5, line:[[@LINE-16]]:9>
 // CHECK:      |         | | `-UnaryOperator {{.+}} <line:[[@LINE-17]]:7, col:9> 'int' lvalue prefix '++'
 // CHECK-NEXT: |         | |   `-DeclRefExpr {{.+}} <col:9> 'int' lvalue OMPCapturedExpr {{.+}} 'a' 'int &'
 
 #pragma omp declare simd
 #pragma omp declare simd inbranch
 void foo();