Start implementing semantic analysis for C initializers.

Step 1: Start instantiating InitListExpr's.
Step 2: Call newly added function Sema::CheckInitializer() from Sema::ParseDeclarator().
Step 3: Give InitListExpr's a preliminary type.
Step 4: Start emitting diagnostics for simple assignments.

Note:

As a result of step 1, the CodeGen/mandel.c test asserts "Unimplemented agg expr!", which is expected.

As a result of step 4, the test below now fails. This isn't expected and needs to be investigated (it appears type checking for C++ references is flawed in some way).

******************** TEST 'Sema/cxx-references.cpp' FAILED! ********************
Command: 
 clang -fsyntax-only Sema/cxx-references.cpp
Output:
Sema/cxx-references.cpp:8:12: warning: incompatible pointer types assigning 'int &*' to 'int *'
  int *p = &r;
           ^~
Sema/cxx-references.cpp:10:20: error: incompatible types assigning 'int (int)' to 'int (&)(int)'
  int (&rg)(int) = g;
                   ^
Sema/cxx-references.cpp:13:18: error: incompatible types assigning 'int [3]' to 'int (&)[3]'
  int (&ra)[3] = a;
                 ^
Sema/cxx-references.cpp:16:14: error: incompatible types assigning 'int *' to 'int *&'
  int *& P = Q;
             ^
4 diagnostics generated.
******************** TEST 'Sema/cxx-references.cpp' FAILED! ********************




git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@41671 91177308-0d34-0410-b5e6-96231b3b80d8

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