fix permissive C++ code (MSVC /permissive-) (#8337)

* fix permissive C++ code (MSVC /permissive-)

These were found by the C++ compiler group when doing "Real world code"
build tests using /permissive-.  We are sharing these with you to help you clean up
your code before the new version of the compiler comes out.  For more information on /permissive-
see https://blogs.msdn.microsoft.com/vcblog/2016/11/16/permissive-switch/.

----------------------------
Under /permissive-, skipping the initialization of a variable is not allowed.
As an extension the compiler allowed this when there was no destructor for the type.

    void func(bool b)
    {
        if(b) goto END;

        int value = 0; //error C2362: initialization of 'value' is skipped by 'goto END'
    	int array[10]; //Okay, not initialized.
        //... value used here

    END:
        return;
    }

Fix 1) Limit the scope of value:

    {
      int value = 0;
      //... value used here
    }
    END:

Fix 2) Initialize/declare value before the 'goto'

    int value = 0;
    if(b) goto END;
    //... value used here
    END:

Fix 3) Don't initialize value in the variable declaration.

    int value;
    value = 0
    //... value used here
    END:

-------------------
Alternative token representations.
The following are reserved as alternative representations for operators:
  and and_eq bitand bitor compl not not_eq or or_eq xor xor_eq

    //Can't use reserved names for variables:
    static int and = 0; // Change name (possibly to 'and_')

    void func()
    {
        _asm {
            xor     edx,edx // xor is reserved, change to uppercase XOR
            or      eax,eax // or is reserved, change to uppercase OR
        }
    }

* Apply formatting patch.

* fixes from code review.

I addressed @janvorli requests from the pull request code review.

1 files changed, 28 insertions, 27 deletions

diff --git a/src/vm/excep.cpp b/src/vm/excep.cpp
index c161c47785..b7c55d38a7 100644
--- a/src/vm/excep.cpp
+++ b/src/vm/excep.cpp
@@ -9916,47 +9916,48 @@ PTR_EHWatsonBucketTracker GetWatsonBucketTrackerForPreallocatedException(OBJECTR
         goto doValidation;
     }
 
-    // Find the reference to the exception tracker corresponding to the preallocated exception,
-    // starting the search from the current exception tracker (2nd arg of NULL specifies that).
-#if defined(WIN64EXCEPTIONS)
-    PTR_ExceptionTracker pEHTracker = NULL;
-    PTR_ExceptionTracker pPreviousEHTracker = NULL;
+    {
+        // Find the reference to the exception tracker corresponding to the preallocated exception,
+        // starting the search from the current exception tracker (2nd arg of NULL specifies that).
+ #if defined(WIN64EXCEPTIONS)
+        PTR_ExceptionTracker pEHTracker = NULL;
+        PTR_ExceptionTracker pPreviousEHTracker = NULL;
 
 #elif _TARGET_X86_
-    PTR_ExInfo pEHTracker = NULL;
-    PTR_ExInfo pPreviousEHTracker = NULL;
+        PTR_ExInfo pEHTracker = NULL;
+        PTR_ExInfo pPreviousEHTracker = NULL;
 #else // !(_WIN64 || _TARGET_X86_)
 #error Unsupported platform
 #endif // _WIN64
 
-    if (fStartSearchFromPreviousTracker)
-    {
-        // Get the exception tracker previous to the current one
-        pPreviousEHTracker = GetThread()->GetExceptionState()->GetCurrentExceptionTracker()->GetPreviousExceptionTracker();
+        if (fStartSearchFromPreviousTracker)
+        {
+            // Get the exception tracker previous to the current one
+            pPreviousEHTracker = GetThread()->GetExceptionState()->GetCurrentExceptionTracker()->GetPreviousExceptionTracker();
+
+            // If there is no previous tracker to start from, then simply abort the search attempt.
+            // If we couldnt find the exception tracker, then buckets are not available
+            if (pPreviousEHTracker == NULL)
+            {
+                LOG((LF_EH, LL_INFO100, "GetWatsonBucketTrackerForPreallocatedException - Couldnt find the previous EHTracker to start the search from.\n"));
+                pWBTracker = NULL;
+                goto done;
+            }
+        }
+
+        pEHTracker = GetEHTrackerForPreallocatedException(gc.oPreAllocThrowable, pPreviousEHTracker);
 
-        // If there is no previous tracker to start from, then simply abort the search attempt.
         // If we couldnt find the exception tracker, then buckets are not available
-        if (pPreviousEHTracker == NULL)
+        if (pEHTracker == NULL)
         {
-            LOG((LF_EH, LL_INFO100, "GetWatsonBucketTrackerForPreallocatedException - Couldnt find the previous EHTracker to start the search from.\n"));
+            LOG((LF_EH, LL_INFO100, "GetWatsonBucketTrackerForPreallocatedException - Couldnt find EHTracker for preallocated exception object.\n"));
             pWBTracker = NULL;
             goto done;
         }
-    }
 
-    pEHTracker = GetEHTrackerForPreallocatedException(gc.oPreAllocThrowable, pPreviousEHTracker);
-
-    // If we couldnt find the exception tracker, then buckets are not available
-    if (pEHTracker == NULL)
-    {
-        LOG((LF_EH, LL_INFO100, "GetWatsonBucketTrackerForPreallocatedException - Couldnt find EHTracker for preallocated exception object.\n"));
-        pWBTracker = NULL;
-        goto done;
+        // Get the Watson Bucket Tracker from the exception tracker
+        pWBTracker = pEHTracker->GetWatsonBucketTracker();
     }
-
-    // Get the Watson Bucket Tracker from the exception tracker
-    pWBTracker = pEHTracker->GetWatsonBucketTracker();
-
 doValidation:
     _ASSERTE(pWBTracker != NULL);