SEH: Use the SEHTryEpilogueStack instead of a separate bool

We don't need a bool to track this now that we have a stack for it.

llvm-svn: 228982
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 60ab2ef..90cf5ee 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -3326,7 +3326,7 @@
                            llvm::Attribute::AlwaysInline);
 
   // Disable inlining inside SEH __try blocks.
-  if (IsSEHTryScope)
+  if (isSEHTryScope())
     Attrs =
         Attrs.addAttribute(getLLVMContext(), llvm::AttributeSet::FunctionIndex,
                            llvm::Attribute::NoInline);