Reorganized code to eliminate repeated ampersand logic and removed whitespace skipping.

Author: Karthikdhondi

flang/lib/Parser/prescan.cpp

@@ -1290,30 +1290,20 @@ const char *Prescanner::FreeFormContinuationLine(bool ampersand) {
   }
   p = SkipWhiteSpace(p);
   if (*p == '!') {
+    ++p;
     if (InCompilerDirective()) {
-      if (*p++ != '!') {
-        return nullptr;
-      }
+   
       for (const char *s{directiveSentinel_}; *s != '\0'; ++p, ++s) {
         if (*s != ToLowerCaseLetter(*p)) {
           return nullptr;
         }
       }
-      p = SkipWhiteSpace(p);
-      if (*p == '&') {
-        if (!ampersand) {
-          insertASpace_ = true;
-        }
-        return p + 1;
-      } else if (ampersand) {
-        return p;
-      } else {
-        return nullptr;
-      }
+    
     } else if (features_.IsEnabled(LanguageFeature::OpenMP)) {
-      if (*p + 1 == '$')
-        return nullptr;
-      p += 2;
+      ++p;
+    } else {
+      return nullptr;
+    }
       p = SkipWhiteSpace(p);
       if (*p == '&') {
         if (!ampersand) {
@@ -1325,9 +1315,6 @@ const char *Prescanner::FreeFormContinuationLine(bool ampersand) {
       } else {
         return nullptr;
       }
-    } else {
-      return nullptr;
-    }
   } else {
     if (*p == '&') {
       p = SkipWhiteSpace(p + 1);