Implement GcInfo v2 for X86

This commit includes the following changes:
1) Thread GcInfo version through X86 specific APIs
2) Add ReturnKind and ReversePinvokeOffset fields to InfoHdr structure
   GcInfo v1 and v2 use the same InfoHdr structures, because:
   InfoHdrSmall: ReturnKind is encoded within previously unused bits.
   InfoHdr: revPInvokeOffset will never be written to the image,
            since ReversePinvokeOffset==INVALID_REV_PINVOKE_OFFSET for V1.
3) Update the Pre-computed header table to include bits for the above
   [The default setting of ReturnKind=RT_Scalar is used for all entries in the table.
    Optimizing this table based in most frequent usage scenarios is to be done separately]
4) Change the GC encoder/decoder to handle the above two fields
5) Use the ReturnKind in the GCInfo from thread-suspension code.

GcInfo version is changed for CoreCLR X86 only, not for Desktop JIT
Fixes #4379

1 files changed, 2 insertions, 2 deletions

diff --git a/src/vm/stackwalk.cpp b/src/vm/stackwalk.cpp
index 3b0b4720f7..29b5617414 100644
--- a/src/vm/stackwalk.cpp
+++ b/src/vm/stackwalk.cpp
@@ -2416,7 +2416,7 @@ StackWalkAction StackFrameIterator::NextRaw(void)
                 OBJECTREF      orUnwind = NULL;
 
                 if (m_crawl.GetCodeManager()->IsInSynchronizedRegion(m_crawl.GetRelOffset(),
-                                                                    m_crawl.GetGCInfo(), 
+                                                                    m_crawl.GetGCInfoToken(), 
                                                                     m_crawl.GetCodeManagerFlags()))
                 {
                     if (pMD->IsStatic())
@@ -3158,7 +3158,7 @@ void StackFrameIterator::PreProcessingForManagedFrames(void)
          m_crawl.pFunc->IsSynchronized() && 
          !m_crawl.pFunc->IsStatic()      &&
          m_crawl.GetCodeManager()->IsInSynchronizedRegion(m_crawl.GetRelOffset(), 
-                                                         m_crawl.GetGCInfo(), 
+                                                         m_crawl.GetGCInfoToken(), 
                                                          m_crawl.GetCodeManagerFlags()))
     {
         BEGIN_GCX_ASSERT_COOP;