Merging r214734:

Merging r214734:
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r214734 | ogoffart | 2014-08-04 10:28:05 -0700 (Mon, 04 Aug 2014) | 7 lines

Fix crash when assiging to a property with an invalid type

This is a regression from clang 3.4

Set the result to ExprError and returns true, rather than simply
returns false because errors have been reported already and returning
false show a confusing error
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git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_35@214839 91177308-0d34-0410-b5e6-96231b3b80d8