Analyzer: Fix PR12905, a crash when encountering a call to a function named "C".

While there clean up indentation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@157204 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Analysis/PR12905.c b/test/Analysis/PR12905.c
new file mode 100644
index 0000000..8f678d1
--- /dev/null
+++ b/test/Analysis/PR12905.c
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -analyze -analyzer-checker=core %s
+// PR12905
+
+void C(void);
+
+void t(void) {
+  C();
+}