Switch users of the 'for (StmtRange range = stmt->children(); range; ++range)‘ pattern to range for loops.

The pattern was born out of the lack of range-based for loops in C++98
and is somewhat obscure. No functionality change intended.

llvm-svn: 241300
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 7286301..867cb9f 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -3344,8 +3344,7 @@
       return StmtError();
     // All associated statements must be '#pragma omp section' except for
     // the first one.
-    for (++S; S; ++S) {
-      auto SectionStmt = *S;
+    for (Stmt *SectionStmt : ++S) {
       if (!SectionStmt || !isa<OMPSectionDirective>(SectionStmt)) {
         if (SectionStmt)
           Diag(SectionStmt->getLocStart(),
@@ -3503,8 +3502,7 @@
       return StmtError();
     // All associated statements must be '#pragma omp section' except for
     // the first one.
-    for (++S; S; ++S) {
-      auto SectionStmt = *S;
+    for (Stmt *SectionStmt : ++S) {
       if (!SectionStmt || !isa<OMPSectionDirective>(SectionStmt)) {
         if (SectionStmt)
           Diag(SectionStmt->getLocStart(),