Remove dead return in BugReporter (found via -Wunreachable-code).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203077 91177308-0d34-0410-b5e6-96231b3b80d8
Remove dead return in Parser::MayBeDesignationStart().

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203078 91177308-0d34-0410-b5e6-96231b3b80d8
Remove 2 dead 'break' statements.  The 'break' usage in this switch is inconsistent, making this hard to see.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203079 91177308-0d34-0410-b5e6-96231b3b80d8
Remove 'break' dominated by 'return' in 'EmitBuiltinExpr'.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@203080 91177308-0d34-0410-b5e6-96231b3b80d8