Aliases are always definitions. Delete dead code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207869 91177308-0d34-0410-b5e6-96231b3b80d8
Satisfy GCC's urgent need for parentheses around ‘&&’ within ‘||’.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207871 91177308-0d34-0410-b5e6-96231b3b80d8
[sanitizers] Propagate the sanitizer options through to the lit context.
This makes it *really* easy to debug leaks FYI:

ASAN_OPTIONS=detect_leaks=1 ./bin/llvm-lit -v <path to test>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207874 91177308-0d34-0410-b5e6-96231b3b80d8
Try simplifying LexicalScopes ownership again.

Committed initially in r207724-r207726 and reverted due to compiler-rt
crashes in r207732.

Instead, fix this harder with unordered_map and store the LexicalScopes
by value in the map. This did necessitate moving the definition of
LexicalScope above the definition of LexicalScopes.

Let's see how the buildbots/compilers tolerate unordered_map::emplace +
std::piecewise_construct + std::forward_as_tuple...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207876 91177308-0d34-0410-b5e6-96231b3b80d8
[LSR] Add llc testcase for r207271/r207569.

See PR19608 for the details but to summarize it was easy to modify the .ll
file to get the desired def-use ordering.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207887 91177308-0d34-0410-b5e6-96231b3b80d8