[PATCH] Pass a SourceLocation down to ubsan's "load_invalid_value" handler.

[Nick Lewycky]

Hi rsmith,

This patch threads through a SourceLocation when scalars are loaded / undergo lvalue-to-rvalue conversion into EmitCheck for "load_invalid_value".

The change to compiler-rt is not included here.

http://llvm-reviews.chandlerc.com/D1801

Files:
  lib/CodeGen/CGStmt.cpp
  lib/CodeGen/CGVTables.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/CGExpr.cpp
  lib/CodeGen/CodeGenFunction.cpp
  lib/CodeGen/CGExprComplex.cpp
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CGBlocks.cpp
  lib/CodeGen/CGExprAgg.cpp
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/CGClass.cpp
  lib/CodeGen/CGAtomic.cpp
  lib/CodeGen/CGObjC.cpp
  lib/CodeGen/CGException.cpp
  lib/CodeGen/CGCall.cpp
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