Teach GRExprEngine::VisitLValue() about FloatingLiteral, ImaginaryLiteral, and CharacterLiteral.  Fixes an assertion failure reported in PR 7675.

llvm-svn: 109719
diff --git a/clang/lib/Checker/GRExprEngine.cpp b/clang/lib/Checker/GRExprEngine.cpp
index 73fc926..9ee723e 100644
--- a/clang/lib/Checker/GRExprEngine.cpp
+++ b/clang/lib/Checker/GRExprEngine.cpp
@@ -1058,6 +1058,9 @@
     // In C++, binding an rvalue to a reference requires to create an object.
     case Stmt::CXXBoolLiteralExprClass:
     case Stmt::IntegerLiteralClass:
+    case Stmt::CharacterLiteralClass:
+    case Stmt::FloatingLiteralClass:
+    case Stmt::ImaginaryLiteralClass:
       CreateCXXTemporaryObject(Ex, Pred, Dst);
       return;