Issue local statics in correct DWARF lexical scope

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Summary

Test for local statics in lexical scope for matching clang and LLVM patches.

[probinson]

+cfe-commits
See also the LLVM change in D42369 and Clang change in D42370.

local-lexical-static.cpp

+// RUN: %clangxx -g -O0 %s -c -o %t.o
+// RUN: llvm-dwarfdump -debug-info -verbose %t.o | FileCheck %s
+
+// static in local lexical block
+
+// CHECK: .debug_info contents:
+// CHECK: DW_TAG_subprogram
+// CHECK: DW_TAG_variable
+// CHECK: DW_AT_name [DW_FORM_strp]     ({{.*}}"localStaticVar")
+// CHECK: DW_TAG_lexical_block
+// CHECK: DW_AT_name [DW_FORM_strp]     ({{.*}}"localStaticVar")
+
+
+int g;
+int main()
+{
+    static float localStaticVar = 50;
+    g = localStaticVar;
+    {
+      static float localStaticVar = 90;
+      g += localStaticVar;
+    }
+    return 0;
+}