Fix exceptions in GC wave 2 (#6220)

I've removed blocks with PAL_TRY that were under CATCH_GC. I also had to
fix contract problem in GCToEEInterface::GcStartWork that was marked as
THROWS due to StubHelpers::ProcessByrefValidationList being marked as
THROWS, but the StubHelpers::ProcessByrefValidationList in fact doesn't
throw since it has body wrapped in EX_TRY / EX_CATCH.

This also fixes a problem that started to appear after my previous exceptions
fix change.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vm/stubhelpers.cpp b/src/vm/stubhelpers.cpp
index 673d96bfe6..bb2af8e052 100644
--- a/src/vm/stubhelpers.cpp
+++ b/src/vm/stubhelpers.cpp
@@ -143,7 +143,7 @@ void StubHelpers::ProcessByrefValidationList()
 {
     CONTRACTL
     {
-        THROWS;
+        NOTHROW;
         GC_NOTRIGGER;
         MODE_ANY;           
     }