Introduce Decl::hasBody() and FunctionDecl::hasBody() and use them instead of getBody() when we are just checking the existence of a body, to avoid de-serialization of the body from PCH.

Makes de-serialization of the function body even more "lazier".

llvm-svn: 107768
diff --git a/clang/lib/Checker/GRExprEngine.cpp b/clang/lib/Checker/GRExprEngine.cpp
index e5c9bb9..d4a410e 100644
--- a/clang/lib/Checker/GRExprEngine.cpp
+++ b/clang/lib/Checker/GRExprEngine.cpp
@@ -1885,7 +1885,7 @@
   if (!FD)
     return false;
 
-  if (!FD->getBody(FD))
+  if (!FD->hasBody(FD))
     return false;
 
   // Now we have the definition of the callee, create a CallEnter node.